18039456 has 48 divisors (see below), whose sum is σ = 52617600. Its totient is φ = 6012864.

The previous prime is 18039449. The next prime is 18039491. The reversal of 18039456 is 65493081.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18039456.

It is a congruent number.

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, 9576 + ... + 11303.

It is an arithmetic number, because the mean of its divisors is an integer number (1096200).

Almost surely, 2^18039456 is an apocalyptic number.

18039456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18039456 is an abundant number, since it is smaller than the sum of its proper divisors (34578144).

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

18039456 is a wasteful number, since it uses less digits than its factorization.

18039456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20898 (or 20884 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 18039456 is about 4247.2880759374. The cubic root of 18039456 is about 262.2654885144.

The spelling of 18039456 in words is "eighteen million, thirty-nine thousand, four hundred fifty-six".