407979421 has 2 divisors, whose sum is σ = 407979422. Its totient is φ = 407979420.

The previous prime is 407979409. The next prime is 407979431. The reversal of 407979421 is 124979704.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 352312900 + 55666521 = 18770^2 + 7461^2 .

It is a cyclic number.

It is not a de Polignac number, because 407979421 - 2²⁵ = 374424989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (407979431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203989710 + 203989711.

It is an arithmetic number, because the mean of its divisors is an integer number (203989711).

Almost surely, 2^407979421 is an apocalyptic number.

It is an amenable number.

407979421 is a deficient number, since it is larger than the sum of its proper divisors (1).

407979421 is an equidigital number, since it uses as much as digits as its factorization.

407979421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 407979421 is about 20198.5004641434. The cubic root of 407979421 is about 741.6734837455.

The spelling of 407979421 in words is "four hundred seven million, nine hundred seventy-nine thousand, four hundred twenty-one".