12402979 has 4 divisors (see below), whose sum is σ = 13132584. Its totient is φ = 11673376.

The previous prime is 12402977. The next prime is 12402997. The reversal of 12402979 is 97920421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97920421 = 79 ⋅1239499.

It is a cyclic number.

It is not a de Polignac number, because 12402979 - 2¹ = 12402977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12402977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364777 + ... + 364810.

It is an arithmetic number, because the mean of its divisors is an integer number (3283146).

Almost surely, 2^12402979 is an apocalyptic number.

12402979 is a deficient number, since it is larger than the sum of its proper divisors (729605).

12402979 is an equidigital number, since it uses as much as digits as its factorization.

12402979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729604.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 12402979 is about 3521.7863365059. The cubic root of 12402979 is about 231.4774393469.

The spelling of 12402979 in words is "twelve million, four hundred two thousand, nine hundred seventy-nine".