18640032 has 24 divisors (see below), whose sum is σ = 48930336. Its totient is φ = 6213312.

The previous prime is 18640031. The next prime is 18640033. The reversal of 18640032 is 23004681.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18640031) and next prime (18640033).

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×18640032² = 694901585922048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 18639984 and 18640011.

It is not an unprimeable number, because it can be changed into a prime (18640031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96988 + ... + 97179.

It is an arithmetic number, because the mean of its divisors is an integer number (2038764).

Almost surely, 2^18640032 is an apocalyptic number.

18640032 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18640032 is an abundant number, since it is smaller than the sum of its proper divisors (30290304).

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

18640032 is a wasteful number, since it uses less digits than its factorization.

18640032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194180 (or 194172 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 18640032 is about 4317.4103349114. The cubic root of 18640032 is about 265.1442527777.

The spelling of 18640032 in words is "eighteen million, six hundred forty thousand, thirty-two".