405640674 has 12 divisors (see below), whose sum is σ = 878888166. Its totient is φ = 135213552.

The previous prime is 405640663. The next prime is 405640681. The reversal of 405640674 is 476046504.

405640674 is a `hidden beast` number, since 4 + 0 + 5 + 640 + 6 + 7 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 318087225 + 87553449 = 17835^2 + 9357^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11267779 + ... + 11267814.

Almost surely, 2^405640674 is an apocalyptic number.

405640674 is an abundant number, since it is smaller than the sum of its proper divisors (473247492).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

405640674 is a wasteful number, since it uses less digits than its factorization.

405640674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22535601 (or 22535598 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 36.

The square root of 405640674 is about 20140.5231808908. The cubic root of 405640674 is about 740.2535495895.

The spelling of 405640674 in words is "four hundred five million, six hundred forty thousand, six hundred seventy-four".