13440644 has 12 divisors (see below), whose sum is σ = 26881344. Its totient is φ = 5760264.

The previous prime is 13440617. The next prime is 13440653. The reversal of 13440644 is 44604431.

13440644 is an admirable number.

It is a super-2 number, since 2×13440644² = 361301822269472, which contains 22 as substring.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239984 + ... + 240039.

It is an arithmetic number, because the mean of its divisors is an integer number (2240112).

Almost surely, 2^13440644 is an apocalyptic number.

13440644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

13440644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13440644 is a wasteful number, since it uses less digits than its factorization.

13440644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480034 (or 480032 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 13440644 is about 3666.1483876134. The cubic root of 13440644 is about 237.7606755556.

The spelling of 13440644 in words is "thirteen million, four hundred forty thousand, six hundred forty-four".