18030656 has 56 divisors (see below), whose sum is σ = 41306496. Its totient is φ = 7649280.

The previous prime is 18030641. The next prime is 18030697. The reversal of 18030656 is 65603081.

It is a tau number, because it is divible by the number of its divisors (56).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74696 + ... + 74936.

It is an arithmetic number, because the mean of its divisors is an integer number (737616).

Almost surely, 2^18030656 is an apocalyptic number.

18030656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18030656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20653248).

18030656 is an abundant number, since it is smaller than the sum of its proper divisors (23275840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18030656 is a wasteful number, since it uses less digits than its factorization.

18030656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427 (or 417 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 18030656 is about 4246.2519944064. The cubic root of 18030656 is about 262.2228354971. Note that the first 3 decimals are identical.

The spelling of 18030656 in words is "eighteen million, thirty thousand, six hundred fifty-six".