13639812 has 12 divisors (see below), whose sum is σ = 31826256. Its totient is φ = 4546600.

The previous prime is 13639811. The next prime is 13639819. The reversal of 13639812 is 21893631.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (13639811) 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, 568314 + ... + 568337.

It is an arithmetic number, because the mean of its divisors is an integer number (2652188).

Almost surely, 2^13639812 is an apocalyptic number.

13639812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13639812 is an abundant number, since it is smaller than the sum of its proper divisors (18186444).

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

13639812 is a wasteful number, since it uses less digits than its factorization.

13639812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136658 (or 1136656 counting only the distinct ones).

The product of its digits is 7776, while the sum is 33.

The square root of 13639812 is about 3693.2116105092. The cubic root of 13639812 is about 238.9293279136.

It can be divided in two parts, 1363 and 9812, that added together give a triangular number (11175 = T₁₄₉).

The spelling of 13639812 in words is "thirteen million, six hundred thirty-nine thousand, eight hundred twelve".