15724019397 has 4 divisors (see below), whose sum is σ = 20965359200. Its totient is φ = 10482679596.

The previous prime is 15724019393. The next prime is 15724019407. The reversal of 15724019397 is 79391042751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 15724019397 - 2² = 15724019393 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 (15724019393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2620669897 + ... + 2620669902.

It is an arithmetic number, because the mean of its divisors is an integer number (5241339800).

Almost surely, 2^15724019397 is an apocalyptic number.

It is an amenable number.

15724019397 is a deficient number, since it is larger than the sum of its proper divisors (5241339803).

15724019397 is an equidigital number, since it uses as much as digits as its factorization.

15724019397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5241339802.

The product of its (nonzero) digits is 476280, while the sum is 48.

The spelling of 15724019397 in words is "fifteen billion, seven hundred twenty-four million, nineteen thousand, three hundred ninety-seven".