405272646 has 40 divisors (see below), whose sum is σ = 909303384. Its totient is φ = 134913600.

The previous prime is 405272617. The next prime is 405272657. The reversal of 405272646 is 646272504.

405272646 is a `hidden beast` number, since 4 + 0 + 5 + 2 + 7 + 2 + 646 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 405272646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 193521 + ... + 195603.

Almost surely, 2^405272646 is an apocalyptic number.

405272646 is an abundant number, since it is smaller than the sum of its proper divisors (504030738).

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

405272646 is a wasteful number, since it uses less digits than its factorization.

405272646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3298 (or 3289 counting only the distinct ones).

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

The square root of 405272646 is about 20131.3846021579. The cubic root of 405272646 is about 740.0296104538.

The spelling of 405272646 in words is "four hundred five million, two hundred seventy-two thousand, six hundred forty-six".