18828939 has 16 divisors (see below), whose sum is σ = 25920000. Its totient is φ = 12151776.

The previous prime is 18828937. The next prime is 18828941. The reversal of 18828939 is 93982881.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18828937) and next prime (18828941).

It is not a de Polignac number, because 18828939 - 2¹ = 18828937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18828937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11812 + ... + 13310.

It is an arithmetic number, because the mean of its divisors is an integer number (1620000).

Almost surely, 2^18828939 is an apocalyptic number.

18828939 is a deficient number, since it is larger than the sum of its proper divisors (7091061).

18828939 is a wasteful number, since it uses less digits than its factorization.

18828939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634.

The product of its digits is 248832, while the sum is 48.

The square root of 18828939 is about 4339.2325358293. The cubic root of 18828939 is about 266.0369434433.

The spelling of 18828939 in words is "eighteen million, eight hundred twenty-eight thousand, nine hundred thirty-nine".