15379997 has 4 divisors (see below), whose sum is σ = 15388380. Its totient is φ = 15371616.

The previous prime is 15379993. The next prime is 15380003. The reversal of 15379997 is 79997351.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 10666756 + 4713241 = 3266^2 + 2171^2 .

It is a cyclic number.

It is not a de Polignac number, because 15379997 - 2² = 15379993 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 (15379993) 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, 122 + ... + 5547.

It is an arithmetic number, because the mean of its divisors is an integer number (3847095).

Almost surely, 2^15379997 is an apocalyptic number.

It is an amenable number.

15379997 is a deficient number, since it is larger than the sum of its proper divisors (8383).

15379997 is an equidigital number, since it uses as much as digits as its factorization.

15379997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8382.

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

The square root of 15379997 is about 3921.7339277417. The cubic root of 15379997 is about 248.6864275310.

The spelling of 15379997 in words is "fifteen million, three hundred seventy-nine thousand, nine hundred ninety-seven".