18180956 has 24 divisors (see below), whose sum is σ = 33911136. Its totient is φ = 8499200.

The previous prime is 18180937. The next prime is 18180979. The reversal of 18180956 is 65908181.

It is a super-2 number, since 2×18180956² = 661094322147872, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10556 + ... + 12156.

It is an arithmetic number, because the mean of its divisors is an integer number (1412964).

Almost surely, 2^18180956 is an apocalyptic number.

It is an amenable number.

18180956 is a deficient number, since it is larger than the sum of its proper divisors (15730180).

18180956 is a wasteful number, since it uses less digits than its factorization.

18180956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789 (or 1787 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 18180956 is about 4263.9132261339. The cubic root of 18180956 is about 262.9494329475.

The spelling of 18180956 in words is "eighteen million, one hundred eighty thousand, nine hundred fifty-six".