18044658 has 12 divisors (see below), whose sum is σ = 39096798. Its totient is φ = 6014880.

The previous prime is 18044657. The next prime is 18044669. The reversal of 18044658 is 85644081.

It can be written as a sum of positive squares in only one way, i.e., 12299049 + 5745609 = 3507^2 + 2397^2 .

It is not an unprimeable number, because it can be changed into a prime (18044657) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 501223 + ... + 501258.

Almost surely, 2^18044658 is an apocalyptic number.

18044658 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18044658 is an abundant number, since it is smaller than the sum of its proper divisors (21052140).

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

18044658 is a wasteful number, since it uses less digits than its factorization.

18044658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002489 (or 1002486 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 18044658 is about 4247.9004225617. The cubic root of 18044658 is about 262.2906957407.

The spelling of 18044658 in words is "eighteen million, forty-four thousand, six hundred fifty-eight".