12400879 has 2 divisors, whose sum is σ = 12400880. Its totient is φ = 12400878.

The previous prime is 12400859. The next prime is 12400889. The reversal of 12400879 is 97800421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12400879 - 2⁵ = 12400847 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12400879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12400849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6200439 + 6200440.

It is an arithmetic number, because the mean of its divisors is an integer number (6200440).

Almost surely, 2^12400879 is an apocalyptic number.

12400879 is a deficient number, since it is larger than the sum of its proper divisors (1).

12400879 is an equidigital number, since it uses as much as digits as its factorization.

12400879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 12400879 is about 3521.4881797331. The cubic root of 12400879 is about 231.4643744733.

The spelling of 12400879 in words is "twelve million, four hundred thousand, eight hundred seventy-nine".