13664842 has 4 divisors (see below), whose sum is σ = 20497266. Its totient is φ = 6832420.

The previous prime is 13664839. The next prime is 13664879. The reversal of 13664842 is 24846631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24846631 = 83 ⋅299357.

It can be written as a sum of positive squares in only one way, i.e., 11296321 + 2368521 = 3361^2 + 1539^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13664798 and 13664807.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3416209 + ... + 3416212.

Almost surely, 2^13664842 is an apocalyptic number.

13664842 is a deficient number, since it is larger than the sum of its proper divisors (6832424).

13664842 is an equidigital number, since it uses as much as digits as its factorization.

13664842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6832423.

The product of its digits is 27648, while the sum is 34.

The square root of 13664842 is about 3696.5987069196. The cubic root of 13664842 is about 239.0753892292.

The spelling of 13664842 in words is "thirteen million, six hundred sixty-four thousand, eight hundred forty-two".