13399687 has 12 divisors (see below), whose sum is σ = 15846456. Its totient is φ = 11294640.

The previous prime is 13399681. The next prime is 13399691. The reversal of 13399687 is 78699331.

It is not a de Polignac number, because 13399687 - 2³ = 13399679 is a prime.

It is a super-2 number, since 2×13399687² = 359103223395938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13399681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 748 + ... + 5230.

It is an arithmetic number, because the mean of its divisors is an integer number (1320538).

Almost surely, 2^13399687 is an apocalyptic number.

13399687 is the 2989-th pentagonal number.

13399687 is a deficient number, since it is larger than the sum of its proper divisors (2446769).

13399687 is an equidigital number, since it uses as much as digits as its factorization.

13399687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4558 (or 4551 counting only the distinct ones).

The product of its digits is 244944, while the sum is 46.

The square root of 13399687 is about 3660.5582907529. The cubic root of 13399687 is about 237.5189244385.

Adding to 13399687 its product of digits (244944), we get a palindrome (13644631).

It can be divided in two parts, 1339 and 9687, that added together give a triangular number (11026 = T₁₄₈).

The spelling of 13399687 in words is "thirteen million, three hundred ninety-nine thousand, six hundred eighty-seven".