13988765 has 12 divisors (see below), whose sum is σ = 19527516. Its totient is φ = 9592128.

The previous prime is 13988713. The next prime is 13988783. The reversal of 13988765 is 56788931.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2079364 + 11909401 = 1442^2 + 3451^2 .

It is not a de Polignac number, because 13988765 - 2¹⁶ = 13923229 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28304 + ... + 28793.

It is an arithmetic number, because the mean of its divisors is an integer number (1627293).

Almost surely, 2^13988765 is an apocalyptic number.

It is an amenable number.

13988765 is a deficient number, since it is larger than the sum of its proper divisors (5538751).

13988765 is an equidigital number, since it uses as much as digits as its factorization.

13988765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57116 (or 57109 counting only the distinct ones).

The product of its digits is 362880, while the sum is 47.

The square root of 13988765 is about 3740.1557454202. The cubic root of 13988765 is about 240.9497378582.

The spelling of 13988765 in words is "thirteen million, nine hundred eighty-eight thousand, seven hundred sixty-five".