18789939 has 24 divisors (see below), whose sum is σ = 31336032. Its totient is φ = 10627200.

The previous prime is 18789923. The next prime is 18789959. The reversal of 18789939 is 93998781.

18789939 = 1152² + 1153² + ... + 1165².

It is not a de Polignac number, because 18789939 - 2⁴ = 18789923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18789959) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4887 + ... + 7839.

It is an arithmetic number, because the mean of its divisors is an integer number (1305668).

Almost surely, 2^18789939 is an apocalyptic number.

18789939 is a deficient number, since it is larger than the sum of its proper divisors (12546093).

18789939 is a wasteful number, since it uses less digits than its factorization.

18789939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3067 (or 3064 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 18789939 is about 4334.7363241609. The cubic root of 18789939 is about 265.8531375027.

The spelling of 18789939 in words is "eighteen million, seven hundred eighty-nine thousand, nine hundred thirty-nine".