13669731 has 12 divisors (see below), whose sum is σ = 19808152. Its totient is φ = 9084096.

The previous prime is 13669727. The next prime is 13669739. The reversal of 13669731 is 13796631.

It is not a de Polignac number, because 13669731 - 2² = 13669727 is a prime.

It is a super-2 number, since 2×13669731² = 373723091224722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13669739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 780 + ... + 5286.

Almost surely, 2^13669731 is an apocalyptic number.

13669731 is a deficient number, since it is larger than the sum of its proper divisors (6138421).

13669731 is a wasteful number, since it uses less digits than its factorization.

13669731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4850 (or 4847 counting only the distinct ones).

The product of its digits is 20412, while the sum is 36.

The square root of 13669731 is about 3697.2599313546. The cubic root of 13669731 is about 239.1038979186.

It can be divided in two parts, 13669 and 731, that added together give a square (14400 = 120²).

The spelling of 13669731 in words is "thirteen million, six hundred sixty-nine thousand, seven hundred thirty-one".