18764438 has 64 divisors (see below), whose sum is σ = 37946880. Its totient is φ = 6795360.

The previous prime is 18764411. The next prime is 18764443. The reversal of 18764438 is 83446781.

It is a junction number, because it is equal to n+sod(n) for n = 18764395 and 18764404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 354020 + ... + 354072.

It is an arithmetic number, because the mean of its divisors is an integer number (592920).

Almost surely, 2^18764438 is an apocalyptic number.

18764438 is an abundant number, since it is smaller than the sum of its proper divisors (19182442).

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

18764438 is a wasteful number, since it uses less digits than its factorization.

18764438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114 (or 92 counting only the distinct ones).

The product of its digits is 129024, while the sum is 41.

The square root of 18764438 is about 4331.7938547442. The cubic root of 18764438 is about 265.7328144202.

The spelling of 18764438 in words is "eighteen million, seven hundred sixty-four thousand, four hundred thirty-eight".