406979217 has 6 divisors (see below), whose sum is σ = 587858882. Its totient is φ = 271319472.

The previous prime is 406979207. The next prime is 406979231. The reversal of 406979217 is 712979604.

It can be written as a sum of positive squares in only one way, i.e., 291180096 + 115799121 = 17064^2 + 10761^2 .

It is not a de Polignac number, because 406979217 - 2¹⁶ = 406913681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406979207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22609948 + ... + 22609965.

Almost surely, 2^406979217 is an apocalyptic number.

It is an amenable number.

406979217 is a deficient number, since it is larger than the sum of its proper divisors (180879665).

406979217 is a wasteful number, since it uses less digits than its factorization.

406979217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45219919 (or 45219916 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 406979217 is about 20173.7259077246. The cubic root of 406979217 is about 741.0668911952.

The spelling of 406979217 in words is "four hundred six million, nine hundred seventy-nine thousand, two hundred seventeen".