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22287841 = 47212
BaseRepresentation
bin101010100000…
…1010111100001
31112221100011121
41111001113201
521201202331
62113412241
7360305062
oct125012741
945840147
1022287841
1111643204
12756a081
134804894
142d62569
151e53c11
hex15415e1

22287841 has 3 divisors (see below), whose sum is σ = 22292563. Its totient is φ = 22283120.

The previous prime is 22287829. The next prime is 22287847. The reversal of 22287841 is 14878222.

The square root of 22287841 is 4721.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 14878222 = 27439111.

It can be written as a sum of positive squares in only one way, i.e., 12047841 + 10240000 = 3471^2 + 3200^2 .

It is not a de Polignac number, because 22287841 - 223 = 13899233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22287797 and 22287806.

It is not an unprimeable number, because it can be changed into a prime (22287847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2361 + ... + 7081.

Almost surely, 222287841 is an apocalyptic number.

22287841 is the 4721-st square number.

22287841 is the 2361-st centered octagonal number.

It is an amenable number.

22287841 is a deficient number, since it is larger than the sum of its proper divisors (4722).

22287841 is an frugal number, since it uses more digits than its factorization.

22287841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9442 (or 4721 counting only the distinct ones).

The product of its digits is 14336, while the sum is 34.

The cubic root of 22287841 is about 281.4206749409.

The spelling of 22287841 in words is "twenty-two million, two hundred eighty-seven thousand, eight hundred forty-one".

Divisors: 1 4721 22287841