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27421 = 171613
BaseRepresentation
bin110101100011101
31101121121
412230131
51334141
6330541
7142642
oct65435
941547
1027421
1119669
1213a51
13c634
149dc9
1581d1
hex6b1d

27421 has 4 divisors (see below), whose sum is σ = 29052. Its totient is φ = 25792.

The previous prime is 27409. The next prime is 27427. The reversal of 27421 is 12472.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19321 + 8100 = 139^2 + 90^2 .

It is a cyclic number.

It is not a de Polignac number, because 27421 - 211 = 25373 is a prime.

It is a super-2 number, since 2×274212 = 1503822482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27395 and 27404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 790 + ... + 823.

It is an arithmetic number, because the mean of its divisors is an integer number (7263).

227421 is an apocalyptic number.

It is an amenable number.

27421 is a deficient number, since it is larger than the sum of its proper divisors (1631).

27421 is a wasteful number, since it uses less digits than its factorization.

27421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630.

The product of its digits is 112, while the sum is 16.

The square root of 27421 is about 165.5928742428. The cubic root of 27421 is about 30.1551224444.

Adding to 27421 its reverse (12472), we get a palindrome (39893).

The spelling of 27421 in words is "twenty-seven thousand, four hundred twenty-one", and thus it is an iban number.

Divisors: 1 17 1613 27421