405920979 has 12 divisors (see below), whose sum is σ = 586748032. Its totient is φ = 270421200.

The previous prime is 405920971. The next prime is 405920981. The reversal of 405920979 is 979029504.

It is not a de Polignac number, because 405920979 - 2³ = 405920971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405920971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2092 + ... + 28569.

Almost surely, 2^405920979 is an apocalyptic number.

405920979 is a deficient number, since it is larger than the sum of its proper divisors (180827053).

405920979 is a wasteful number, since it uses less digits than its factorization.

405920979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32138 (or 32135 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 405920979 is about 20147.4807109971. The cubic root of 405920979 is about 740.4240198342.

The spelling of 405920979 in words is "four hundred five million, nine hundred twenty thousand, nine hundred seventy-nine".