15721453 has 12 divisors (see below), whose sum is σ = 17550432. Its totient is φ = 13966520.

The previous prime is 15721439. The next prime is 15721463. The reversal of 15721453 is 35412751.

It is a happy number.

It is not a de Polignac number, because 15721453 - 2⁵ = 15721421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15721423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23976 + ... + 24622.

It is an arithmetic number, because the mean of its divisors is an integer number (1462536).

Almost surely, 2^15721453 is an apocalyptic number.

It is an amenable number.

15721453 is a deficient number, since it is larger than the sum of its proper divisors (1828979).

15721453 is an equidigital number, since it uses as much as digits as its factorization.

15721453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752 (or 705 counting only the distinct ones).

The product of its digits is 4200, while the sum is 28.

The square root of 15721453 is about 3965.0287514720. The cubic root of 15721453 is about 250.5133611199.

It can be divided in two parts, 1572 and 1453, that added together give a square (3025 = 55²).

The spelling of 15721453 in words is "fifteen million, seven hundred twenty-one thousand, four hundred fifty-three".