13407440 has 20 divisors (see below), whose sum is σ = 31172484. Its totient is φ = 5362944.

The previous prime is 13407439. The next prime is 13407461. The reversal of 13407440 is 4470431.

13407440 = T₂₀₇ + T₂₀₈ + ... + T₄₄₆.

It can be written as a sum of positive squares in 2 ways, for example, as 8620096 + 4787344 = 2936^2 + 2188^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

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, 83717 + ... + 83876.

Almost surely, 2^13407440 is an apocalyptic number.

13407440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13407440 is an abundant number, since it is smaller than the sum of its proper divisors (17765044).

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

13407440 is a wasteful number, since it uses less digits than its factorization.

13407440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167606 (or 167600 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 13407440 is about 3661.6171290838. The cubic root of 13407440 is about 237.5647247415.

Adding to 13407440 its reverse (4470431), we get a palindrome (17877871).

The spelling of 13407440 in words is "thirteen million, four hundred seven thousand, four hundred forty".