13809572 has 18 divisors (see below), whose sum is σ = 28112742. Its totient is φ = 5918304.

The previous prime is 13809569. The next prime is 13809583. The reversal of 13809572 is 27590831.

It can be written as a sum of positive squares in only one way, i.e., 7529536 + 6280036 = 2744^2 + 2506^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35033 + ... + 35424.

It is an arithmetic number, because the mean of its divisors is an integer number (1561819).

Almost surely, 2^13809572 is an apocalyptic number.

It is an amenable number.

13809572 is an abundant number, since it is smaller than the sum of its proper divisors (14303170).

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

13809572 is a wasteful number, since it uses less digits than its factorization.

13809572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70475 (or 70466 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 13809572 is about 3716.1232487634. The cubic root of 13809572 is about 239.9164755650.

The spelling of 13809572 in words is "thirteen million, eight hundred nine thousand, five hundred seventy-two".