13909072 has 10 divisors (see below), whose sum is σ = 26948858. Its totient is φ = 6954528.

The previous prime is 13909061. The next prime is 13909079. The reversal of 13909072 is 27090931.

It can be written as a sum of positive squares in only one way, i.e., 7974976 + 5934096 = 2824^2 + 2436^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13909079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434643 + ... + 434674.

Almost surely, 2^13909072 is an apocalyptic number.

It is an amenable number.

13909072 is a deficient number, since it is larger than the sum of its proper divisors (13039786).

13909072 is an equidigital number, since it uses as much as digits as its factorization.

13909072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869325 (or 869319 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 13909072 is about 3729.4868279698. The cubic root of 13909072 is about 240.4913083622.

The spelling of 13909072 in words is "thirteen million, nine hundred nine thousand, seventy-two".