13939520 has 112 divisors (see below), whose sum is σ = 39014400. Its totient is φ = 4741632.

The previous prime is 13939511. The next prime is 13939529. The reversal of 13939520 is 2593931.

It is an interprime number because it is at equal distance from previous prime (13939511) and next prime (13939529).

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13939529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109697 + ... + 109823.

Almost surely, 2^13939520 is an apocalyptic number.

13939520 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 13939520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19507200).

13939520 is an abundant number, since it is smaller than the sum of its proper divisors (25074880).

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

13939520 is an equidigital number, since it uses as much as digits as its factorization.

13939520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 13939520 is about 3733.5666593755. The cubic root of 13939520 is about 240.6666649615. Note that the first 5 decimals are identical.

The spelling of 13939520 in words is "thirteen million, nine hundred thirty-nine thousand, five hundred twenty".