13664427 has 16 divisors (see below), whose sum is σ = 21165312. Its totient is φ = 7679520.

The previous prime is 13664419. The next prime is 13664429. The reversal of 13664427 is 72446631.

It is a happy number.

It is not a de Polignac number, because 13664427 - 2³ = 13664419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13664429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4053 + ... + 6614.

It is an arithmetic number, because the mean of its divisors is an integer number (1322832).

Almost surely, 2^13664427 is an apocalyptic number.

13664427 is a deficient number, since it is larger than the sum of its proper divisors (7500885).

13664427 is a wasteful number, since it uses less digits than its factorization.

13664427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10738.

The product of its digits is 24192, while the sum is 33.

The square root of 13664427 is about 3696.5425738114. The cubic root of 13664427 is about 239.0729689721.

The spelling of 13664427 in words is "thirteen million, six hundred sixty-four thousand, four hundred twenty-seven".