13664437 has 4 divisors (see below), whose sum is σ = 13818060. Its totient is φ = 13510816.

The previous prime is 13664429. The next prime is 13664467. The reversal of 13664437 is 73446631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73446631 = 173 ⋅424547.

It can be written as a sum of positive squares in 2 ways, for example, as 3481956 + 10182481 = 1866^2 + 3191^2 .

It is a cyclic number.

It is not a de Polignac number, because 13664437 - 2³ = 13664429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13664467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76678 + ... + 76855.

It is an arithmetic number, because the mean of its divisors is an integer number (3454515).

Almost surely, 2^13664437 is an apocalyptic number.

It is an amenable number.

13664437 is a deficient number, since it is larger than the sum of its proper divisors (153623).

13664437 is an equidigital number, since it uses as much as digits as its factorization.

13664437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153622.

The product of its digits is 36288, while the sum is 34.

The square root of 13664437 is about 3696.5439264264. The cubic root of 13664437 is about 239.0730272921.

The spelling of 13664437 in words is "thirteen million, six hundred sixty-four thousand, four hundred thirty-seven".