13425720 has 128 divisors (see below), whose sum is σ = 50250240. Its totient is φ = 2787840.

The previous prime is 13425707. The next prime is 13425749. The reversal of 13425720 is 2752431.

13425720 = 231² + 232² + ... + 374².

13425720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8514 + ... + 9966.

It is an arithmetic number, because the mean of its divisors is an integer number (392580).

Almost surely, 2^13425720 is an apocalyptic number.

13425720 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 13425720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25125120).

13425720 is an abundant number, since it is smaller than the sum of its proper divisors (36824520).

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

13425720 is a wasteful number, since it uses less digits than its factorization.

13425720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485 (or 1481 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 13425720 is about 3664.1124436895. The cubic root of 13425720 is about 237.6726427091.

Subtracting from 13425720 its reverse (2752431), we obtain a square (10673289 = 3267²).

The spelling of 13425720 in words is "thirteen million, four hundred twenty-five thousand, seven hundred twenty".