13957720 has 64 divisors (see below), whose sum is σ = 36403200. Its totient is φ = 4717440.

The previous prime is 13957703. The next prime is 13957721. The reversal of 13957720 is 2775931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13957721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21805 + ... + 22435.

It is an arithmetic number, because the mean of its divisors is an integer number (568800).

Almost surely, 2^13957720 is an apocalyptic number.

13957720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13957720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18201600).

13957720 is an abundant number, since it is smaller than the sum of its proper divisors (22445480).

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

13957720 is a wasteful number, since it uses less digits than its factorization.

13957720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728 (or 724 counting only the distinct ones).

The product of its (nonzero) digits is 13230, while the sum is 34.

The square root of 13957720 is about 3736.0032119901. The cubic root of 13957720 is about 240.7713607805.

Subtracting from 13957720 its sum of digits (34), we obtain a triangular number (13957686 = T₅₂₈₃).

The spelling of 13957720 in words is "thirteen million, nine hundred fifty-seven thousand, seven hundred twenty".