13909371844 has 27 divisors (see below), whose sum is σ = 24612258951. Its totient is φ = 6878144160.

The previous prime is 13909371823. The next prime is 13909371863. The reversal of 13909371844 is 44817390931.

The square root of 13909371844 is 117938.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 136002244 + 13773369600 = 11662^2 + 117360^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 25710214 + ... + 25710754.

Almost surely, 2^13909371844 is an apocalyptic number.

13909371844 is the 117938-th square number.

It is an amenable number.

13909371844 is a deficient number, since it is larger than the sum of its proper divisors (10702887107).

13909371844 is an frugal number, since it uses more digits than its factorization.

13909371844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1304 (or 652 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 49.

Multiplying 13909371844 by its sum of digits (49), we get a square (681559220356 = 825566²).

The spelling of 13909371844 in words is "thirteen billion, nine hundred nine million, three hundred seventy-one thousand, eight hundred forty-four".