18256947 has 8 divisors (see below), whose sum is σ = 25000656. Its totient is φ = 11842272.

The previous prime is 18256943. The next prime is 18256949. The reversal of 18256947 is 74965281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18256947 - 2² = 18256943 is a prime.

It is a super-2 number, since 2×18256947² = 666632227521618, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 18256899 and 18256908.

It is not an unprimeable number, because it can be changed into a prime (18256943) 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 7 ways as a sum of consecutive naturals, for example, 82128 + ... + 82349.

It is an arithmetic number, because the mean of its divisors is an integer number (3125082).

Almost surely, 2^18256947 is an apocalyptic number.

18256947 is a deficient number, since it is larger than the sum of its proper divisors (6743709).

18256947 is a wasteful number, since it uses less digits than its factorization.

18256947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164517.

The product of its digits is 120960, while the sum is 42.

The square root of 18256947 is about 4272.8148801463. The cubic root of 18256947 is about 263.3152739133.

The spelling of 18256947 in words is "eighteen million, two hundred fifty-six thousand, nine hundred forty-seven".