408404690 has 16 divisors (see below), whose sum is σ = 753059160. Its totient is φ = 159377280.

The previous prime is 408404621. The next prime is 408404701. The reversal of 408404690 is 96404804.

It can be written as a sum of positive squares in 4 ways, for example, as 337052881 + 71351809 = 18359^2 + 8447^2 .

It is a super-2 number, since 2×408404690² = 333588781627992200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 408404690.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 497645 + ... + 498464.

Almost surely, 2^408404690 is an apocalyptic number.

408404690 is a deficient number, since it is larger than the sum of its proper divisors (344654470).

408404690 is a wasteful number, since it uses less digits than its factorization.

408404690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996157.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 408404690 is about 20209.0249641095. The cubic root of 408404690 is about 741.9310957683.

The spelling of 408404690 in words is "four hundred eight million, four hundred four thousand, six hundred ninety".