405779697 has 24 divisors (see below), whose sum is σ = 597093120. Its totient is φ = 265493760.

The previous prime is 405779669. The next prime is 405779707. The reversal of 405779697 is 796977504.

It is a happy number.

405779697 is a `hidden beast` number, since 4 + 0 + 577 + 9 + 69 + 7 = 666.

It is not a de Polignac number, because 405779697 - 2¹⁶ = 405714161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (405779617) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 151393 + ... + 154049.

It is an arithmetic number, because the mean of its divisors is an integer number (24878880).

Almost surely, 2^405779697 is an apocalyptic number.

It is an amenable number.

405779697 is a deficient number, since it is larger than the sum of its proper divisors (191313423).

405779697 is a wasteful number, since it uses less digits than its factorization.

405779697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2973 (or 2970 counting only the distinct ones).

The product of its (nonzero) digits is 3333960, while the sum is 54.

The square root of 405779697 is about 20143.9742106666. The cubic root of 405779697 is about 740.3381076078.

The spelling of 405779697 in words is "four hundred five million, seven hundred seventy-nine thousand, six hundred ninety-seven".