12315979 has 4 divisors (see below), whose sum is σ = 13263376. Its totient is φ = 11368584.

The previous prime is 12315967. The next prime is 12315991. The reversal of 12315979 is 97951321.

12315979 = T₁₃₇₀ + T₁₃₇₁ + ... + T₁₃₈₂.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (12315967) and next prime (12315991).

It is a cyclic number.

It is not a de Polignac number, because 12315979 - 2⁷ = 12315851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12315929) 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, 473679 + ... + 473704.

It is an arithmetic number, because the mean of its divisors is an integer number (3315844).

Almost surely, 2^12315979 is an apocalyptic number.

12315979 is a deficient number, since it is larger than the sum of its proper divisors (947397).

12315979 is an equidigital number, since it uses as much as digits as its factorization.

12315979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947396.

The product of its digits is 17010, while the sum is 37.

The square root of 12315979 is about 3509.4129138647. The cubic root of 12315979 is about 230.9349404183.

The spelling of 12315979 in words is "twelve million, three hundred fifteen thousand, nine hundred seventy-nine".