13239720 has 256 divisors, whose sum is σ = 50803200. Its totient is φ = 3041280.

The previous prime is 13239703. The next prime is 13239727. The reversal of 13239720 is 2793231.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (13239727) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 322900 + ... + 322940.

It is an arithmetic number, because the mean of its divisors is an integer number (198450).

Almost surely, 2^13239720 is an apocalyptic number.

13239720 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 13239720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25401600).

13239720 is an abundant number, since it is smaller than the sum of its proper divisors (37563480).

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

13239720 is a wasteful number, since it uses less digits than its factorization.

13239720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 13239720 is about 3638.6426040489. The cubic root of 13239720 is about 236.5699620337.

The spelling of 13239720 in words is "thirteen million, two hundred thirty-nine thousand, seven hundred twenty".