18238040 has 32 divisors (see below), whose sum is σ = 42148080. Its totient is φ = 7097472.

The previous prime is 18238039. The next prime is 18238067. The reversal of 18238040 is 4083281.

It is a super-2 number, since 2×18238040² = 665252206083200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4682 + ... + 7641.

Almost surely, 2^18238040 is an apocalyptic number.

18238040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18238040 is an abundant number, since it is smaller than the sum of its proper divisors (23910040).

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

18238040 is a wasteful number, since it uses less digits than its factorization.

18238040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12371 (or 12367 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 18238040 is about 4270.6018311240. The cubic root of 18238040 is about 263.2243455768.

The spelling of 18238040 in words is "eighteen million, two hundred thirty-eight thousand, forty".