13664426 has 4 divisors (see below), whose sum is σ = 20496642. Its totient is φ = 6832212.

The previous prime is 13664419. The next prime is 13664429. The reversal of 13664426 is 62446631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12967201 + 697225 = 3601^2 + 835^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13664392 and 13664401.

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 as a sum of consecutive naturals, namely, 3416105 + ... + 3416108.

Almost surely, 2^13664426 is an apocalyptic number.

13664426 is a deficient number, since it is larger than the sum of its proper divisors (6832216).

13664426 is an equidigital number, since it uses as much as digits as its factorization.

13664426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6832215.

The product of its digits is 20736, while the sum is 32.

The square root of 13664426 is about 3696.5424385498. The cubic root of 13664426 is about 239.0729631401.

The spelling of 13664426 in words is "thirteen million, six hundred sixty-four thousand, four hundred twenty-six".