13639969 has 16 divisors (see below), whose sum is σ = 16220160. Its totient is φ = 11224080.

The previous prime is 13639963. The next prime is 13639973. The reversal of 13639969 is 96993631.

It is not a de Polignac number, because 13639969 - 2³ = 13639961 is a prime.

It is a super-2 number, since 2×13639969² = 372097508641922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13639961) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 51732 + ... + 51994.

It is an arithmetic number, because the mean of its divisors is an integer number (1013760).

Almost surely, 2^13639969 is an apocalyptic number.

It is an amenable number.

13639969 is a deficient number, since it is larger than the sum of its proper divisors (2580191).

13639969 is a wasteful number, since it uses less digits than its factorization.

13639969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540.

The product of its digits is 236196, while the sum is 46.

The square root of 13639969 is about 3693.2328656612. The cubic root of 13639969 is about 238.9302446360.

The spelling of 13639969 in words is "thirteen million, six hundred thirty-nine thousand, nine hundred sixty-nine".