18639412 has 24 divisors (see below), whose sum is σ = 37679040. Its totient is φ = 7973760.

The previous prime is 18639403. The next prime is 18639419. The reversal of 18639412 is 21493681.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18639419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11712 + ... + 13207.

It is an arithmetic number, because the mean of its divisors is an integer number (1569960).

Almost surely, 2^18639412 is an apocalyptic number.

It is an amenable number.

18639412 is an abundant number, since it is smaller than the sum of its proper divisors (19039628).

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

18639412 is a wasteful number, since it uses less digits than its factorization.

18639412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24951 (or 24949 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 18639412 is about 4317.3385320125. The cubic root of 18639412 is about 265.1413130249.

The spelling of 18639412 in words is "eighteen million, six hundred thirty-nine thousand, four hundred twelve".