13920440 has 16 divisors (see below), whose sum is σ = 31321080. Its totient is φ = 5568160.

The previous prime is 13920427. The next prime is 13920449. The reversal of 13920440 is 4402931.

13920440 = 377² + 378² + ... + 456².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13920449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173966 + ... + 174045.

Almost surely, 2^13920440 is an apocalyptic number.

13920440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13920440 is an abundant number, since it is smaller than the sum of its proper divisors (17400640).

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

13920440 is a wasteful number, since it uses less digits than its factorization.

13920440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348022 (or 348018 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 13920440 is about 3731.0105869590. The cubic root of 13920440 is about 240.5568090349.

The spelling of 13920440 in words is "thirteen million, nine hundred twenty thousand, four hundred forty".