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22400001 = 3213191453
BaseRepresentation
bin101010101110…
…0110000000001
31120011001000200
41111130300001
521213300001
62120035413
7361253061
oct125346001
946131020
1022400001
111170a4a8
127602b69
134843950
142d913a1
151e77086
hex155cc01

22400001 has 12 divisors (see below), whose sum is σ = 34844628. Its totient is φ = 13784544.

The previous prime is 22399991. The next prime is 22400009. The reversal of 22400001 is 10000422.

It can be written as a sum of positive squares in 2 ways, for example, as 14447601 + 7952400 = 3801^2 + 2820^2 .

It is not a de Polignac number, because 22400001 - 25 = 22399969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (22400009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95610 + ... + 95843.

It is an arithmetic number, because the mean of its divisors is an integer number (2903719).

Almost surely, 222400001 is an apocalyptic number.

It is an amenable number.

22400001 is a deficient number, since it is larger than the sum of its proper divisors (12444627).

22400001 is a wasteful number, since it uses less digits than its factorization.

22400001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191472 (or 191469 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 22400001 is about 4732.8639321240. The cubic root of 22400001 is about 281.8919534774.

Adding to 22400001 its reverse (10000422), we get a palindrome (32400423).

The spelling of 22400001 in words is "twenty-two million, four hundred thousand, one".

Divisors: 1 3 9 13 39 117 191453 574359 1723077 2488889 7466667 22400001