18339640 has 32 divisors (see below), whose sum is σ = 45016560. Its totient is φ = 6668800.

The previous prime is 18339623. The next prime is 18339647. The reversal of 18339640 is 4693381.

It is a junction number, because it is equal to n+sod(n) for n = 18339596 and 18339605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18339647) 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, 20401 + ... + 21280.

Almost surely, 2^18339640 is an apocalyptic number.

18339640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18339640 is an abundant number, since it is smaller than the sum of its proper divisors (26676920).

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

18339640 is a wasteful number, since it uses less digits than its factorization.

18339640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41703 (or 41699 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 18339640 is about 4282.4805895649. The cubic root of 18339640 is about 263.7122285181.

The spelling of 18339640 in words is "eighteen million, three hundred thirty-nine thousand, six hundred forty".