13638737 has 12 divisors (see below), whose sum is σ = 15825408. Its totient is φ = 11514000.

The previous prime is 13638707. The next prime is 13638739. The reversal of 13638737 is 73783631.

It is a happy number.

It is not a de Polignac number, because 13638737 - 2¹⁰ = 13637713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13638737.

It is not an unprimeable number, because it can be changed into a prime (13638739) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71312 + ... + 71502.

It is an arithmetic number, because the mean of its divisors is an integer number (1318784).

Almost surely, 2^13638737 is an apocalyptic number.

It is an amenable number.

13638737 is a deficient number, since it is larger than the sum of its proper divisors (2186671).

13638737 is an equidigital number, since it uses as much as digits as its factorization.

13638737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400 (or 299 counting only the distinct ones).

The product of its digits is 63504, while the sum is 38.

The square root of 13638737 is about 3693.0660703540. The cubic root of 13638737 is about 238.9230508043.

The spelling of 13638737 in words is "thirteen million, six hundred thirty-eight thousand, seven hundred thirty-seven".