18939396 has 48 divisors (see below), whose sum is σ = 52706304. Its totient is φ = 5175456.

The previous prime is 18939379. The next prime is 18939421. The reversal of 18939396 is 69393981.

It is a happy 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, 2970 + ... + 6833.

It is an arithmetic number, because the mean of its divisors is an integer number (1098048).

Almost surely, 2^18939396 is an apocalyptic number.

It is an amenable number.

18939396 is an abundant number, since it is smaller than the sum of its proper divisors (33766908).

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

18939396 is a wasteful number, since it uses less digits than its factorization.

18939396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9840 (or 9838 counting only the distinct ones).

The product of its digits is 314928, while the sum is 48.

The square root of 18939396 is about 4351.9416356381. The cubic root of 18939396 is about 266.5561507325.

The spelling of 18939396 in words is "eighteen million, nine hundred thirty-nine thousand, three hundred ninety-six".