13643812 has 24 divisors (see below), whose sum is σ = 29387456. Its totient is φ = 5397408.

The previous prime is 13643801. The next prime is 13643827. The reversal of 13643812 is 21834631.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18378 + ... + 19105.

Almost surely, 2^13643812 is an apocalyptic number.

It is an amenable number.

13643812 is an abundant number, since it is smaller than the sum of its proper divisors (15743644).

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

13643812 is a wasteful number, since it uses less digits than its factorization.

13643812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37507 (or 37505 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 13643812 is about 3693.7531049056. The cubic root of 13643812 is about 238.9526817033.

The spelling of 13643812 in words is "thirteen million, six hundred forty-three thousand, eight hundred twelve".