18621056 has 16 divisors (see below), whose sum is σ = 37096890. Its totient is φ = 9310464.

The previous prime is 18621047. The next prime is 18621079. The reversal of 18621056 is 65012681.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17774656 + 846400 = 4216^2 + 920^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72611 + ... + 72866.

Almost surely, 2^18621056 is an apocalyptic number.

18621056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18621056 is a deficient number, since it is larger than the sum of its proper divisors (18475834).

18621056 is an equidigital number, since it uses as much as digits as its factorization.

18621056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145491 (or 145479 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 18621056 is about 4315.2121616440. The cubic root of 18621056 is about 265.0542478239.

The spelling of 18621056 in words is "eighteen million, six hundred twenty-one thousand, fifty-six".