18256401 has 16 divisors (see below), whose sum is σ = 27117120. Its totient is φ = 12139200.

The previous prime is 18256387. The next prime is 18256423. The reversal of 18256401 is 10465281.

18256401 is a `hidden beast` number, since 1 + 8 + 256 + 401 = 666.

It is not a de Polignac number, because 18256401 - 2⁹ = 18255889 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18256451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14601 + ... + 15801.

It is an arithmetic number, because the mean of its divisors is an integer number (1694820).

Almost surely, 2^18256401 is an apocalyptic number.

It is an amenable number.

18256401 is a deficient number, since it is larger than the sum of its proper divisors (8860719).

18256401 is a wasteful number, since it uses less digits than its factorization.

18256401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1773 (or 1767 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 18256401 is about 4272.7509873617. The cubic root of 18256401 is about 263.3126489477.

The spelling of 18256401 in words is "eighteen million, two hundred fifty-six thousand, four hundred one".