13725440 has 36 divisors (see below), whose sum is σ = 32879784. Its totient is φ = 5489664.

The previous prime is 13725431. The next prime is 13725449. The reversal of 13725440 is 4452731.

It is an interprime number because it is at equal distance from previous prime (13725431) and next prime (13725449).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13725449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4082 + ... + 6641.

Almost surely, 2^13725440 is an apocalyptic number.

13725440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13725440 is an abundant number, since it is smaller than the sum of its proper divisors (19154344).

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

13725440 is an equidigital number, since it uses as much as digits as its factorization.

13725440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10744 (or 10730 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 13725440 is about 3704.7860936902. The cubic root of 13725440 is about 239.4282687251.

The spelling of 13725440 in words is "thirteen million, seven hundred twenty-five thousand, four hundred forty".