15397979 has 8 divisors (see below), whose sum is σ = 16076160. Its totient is φ = 14731200.

The previous prime is 15397973. The next prime is 15397981. The reversal of 15397979 is 97979351.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-15397979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15397973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32 + ... + 5549.

It is an arithmetic number, because the mean of its divisors is an integer number (2009520).

Almost surely, 2^15397979 is an apocalyptic number.

15397979 is a deficient number, since it is larger than the sum of its proper divisors (678181).

15397979 is an equidigital number, since it uses as much as digits as its factorization.

15397979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5701.

The product of its digits is 535815, while the sum is 50.

The square root of 15397979 is about 3924.0258663775. The cubic root of 15397979 is about 248.7833095971.

The spelling of 15397979 in words is "fifteen million, three hundred ninety-seven thousand, nine hundred seventy-nine".