18431928 has 32 divisors (see below), whose sum is σ = 51200400. Its totient is φ = 6143904.

The previous prime is 18431923. The next prime is 18431951. The reversal of 18431928 is 82913481.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 18431892 and 18431901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18431923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42451 + ... + 42882.

Almost surely, 2^18431928 is an apocalyptic number.

18431928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18431928 is an abundant number, since it is smaller than the sum of its proper divisors (32768472).

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

18431928 is a wasteful number, since it uses less digits than its factorization.

18431928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85348 (or 85338 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 18431928 is about 4293.2421315365. The cubic root of 18431928 is about 264.1538359604.

The spelling of 18431928 in words is "eighteen million, four hundred thirty-one thousand, nine hundred twenty-eight".