405885979 has 2 divisors, whose sum is σ = 405885980. Its totient is φ = 405885978.

The previous prime is 405885911. The next prime is 405886043. The reversal of 405885979 is 979588504.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 405885979 - 2¹¹ = 405883931 is a prime.

It is not a weakly prime, because it can be changed into another prime (405883979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202942989 + 202942990.

It is an arithmetic number, because the mean of its divisors is an integer number (202942990).

Almost surely, 2^405885979 is an apocalyptic number.

405885979 is a deficient number, since it is larger than the sum of its proper divisors (1).

405885979 is an equidigital number, since it uses as much as digits as its factorization.

405885979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3628800, while the sum is 55.

The square root of 405885979 is about 20146.6120973230. The cubic root of 405885979 is about 740.4027385284.

The spelling of 405885979 in words is "four hundred five million, eight hundred eighty-five thousand, nine hundred seventy-nine".