18939264 has 128 divisors (see below), whose sum is σ = 54574080. Its totient is φ = 5806080.

The previous prime is 18939259. The next prime is 18939287. The reversal of 18939264 is 46293981.

It is a tau number, because it is divible by the number of its divisors (128).

Its product of digits (93312) is a multiple of the sum of its prime factors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 440427 + ... + 440469.

It is an arithmetic number, because the mean of its divisors is an integer number (426360).

Almost surely, 2^18939264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18939264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27287040).

18939264 is an abundant number, since it is smaller than the sum of its proper divisors (35634816).

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

18939264 is a wasteful number, since it uses less digits than its factorization.

18939264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 116 counting only the distinct ones).

The product of its digits is 93312, while the sum is 42.

The square root of 18939264 is about 4351.9264699671. The cubic root of 18939264 is about 266.5555314678. Note that the first 4 decimals are identical.

The spelling of 18939264 in words is "eighteen million, nine hundred thirty-nine thousand, two hundred sixty-four".