13620440 has 32 divisors (see below), whose sum is σ = 31477680. Its totient is φ = 5300352.

The previous prime is 13620421. The next prime is 13620457. The reversal of 13620440 is 4402631.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3122 + ... + 6081.

Almost surely, 2^13620440 is an apocalyptic number.

13620440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13620440 is an abundant number, since it is smaller than the sum of its proper divisors (17857240).

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

13620440 is a wasteful number, since it uses less digits than its factorization.

13620440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9251 (or 9247 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 13620440 is about 3690.5880290274. The cubic root of 13620440 is about 238.8161608625.

The spelling of 13620440 in words is "thirteen million, six hundred twenty thousand, four hundred forty".