15723404449 has 9 divisors (see below), whose sum is σ = 16164616377. Its totient is φ = 15293933424.

The previous prime is 15723404387. The next prime is 15723404513. The reversal of 15723404449 is 94440432751.

The square root of 15723404449 is 125393.

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 12079109025 + 3644295424 = 109905^2 + 60368^2 .

It is not a de Polignac number, because 15723404449 - 2²⁵ = 15689850017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15723404149) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4637847 + ... + 4641235.

Almost surely, 2^15723404449 is an apocalyptic number.

15723404449 is the 125393-rd square number.

15723404449 is the 62697-th centered octagonal number.

It is an amenable number.

15723404449 is a deficient number, since it is larger than the sum of its proper divisors (441211928).

15723404449 is an frugal number, since it uses more digits than its factorization.

15723404449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6852 (or 3426 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 43.

The spelling of 15723404449 in words is "fifteen billion, seven hundred twenty-three million, four hundred four thousand, four hundred forty-nine".