13766440 has 16 divisors (see below), whose sum is σ = 30974580. Its totient is φ = 5506560.

The previous prime is 13766437. The next prime is 13766453. The reversal of 13766440 is 4466731.

It can be written as a sum of positive squares in 2 ways, for example, as 12945604 + 820836 = 3598^2 + 906^2 .

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, 172041 + ... + 172120.

Almost surely, 2^13766440 is an apocalyptic number.

13766440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13766440 is an abundant number, since it is smaller than the sum of its proper divisors (17208140).

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

13766440 is a wasteful number, since it uses less digits than its factorization.

13766440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344172 (or 344168 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 13766440 is about 3710.3153504790. The cubic root of 13766440 is about 239.6664347555. Note that the first 3 decimals are identical.

The spelling of 13766440 in words is "thirteen million, seven hundred sixty-six thousand, four hundred forty".