405494979 has 16 divisors (see below), whose sum is σ = 569642880. Its totient is φ = 255864960.

The previous prime is 405494977. The next prime is 405494981. The reversal of 405494979 is 979494504.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (405494977) and next prime (405494981).

It is not a de Polignac number, because 405494979 - 2¹ = 405494977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (405494977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74964 + ... + 80190.

It is an arithmetic number, because the mean of its divisors is an integer number (35602680).

Almost surely, 2^405494979 is an apocalyptic number.

405494979 is a deficient number, since it is larger than the sum of its proper divisors (164147901).

405494979 is a wasteful number, since it uses less digits than its factorization.

405494979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6610.

The product of its (nonzero) digits is 1632960, while the sum is 51.

The square root of 405494979 is about 20136.9058944020. The cubic root of 405494979 is about 740.1649127221.

The spelling of 405494979 in words is "four hundred five million, four hundred ninety-four thousand, nine hundred seventy-nine".