405661450 has 24 divisors (see below), whose sum is σ = 762010380. Its totient is φ = 160656000.

The previous prime is 405661433. The next prime is 405661471. The reversal of 405661450 is 54166504.

It can be written as a sum of positive squares in 6 ways, for example, as 327356649 + 78304801 = 18093^2 + 8849^2 .

It is a super-2 number, since 2×405661450² = 329122424032205000, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35115 + ... + 45214.

Almost surely, 2^405661450 is an apocalyptic number.

405661450 is a deficient number, since it is larger than the sum of its proper divisors (356348930).

405661450 is a wasteful number, since it uses less digits than its factorization.

405661450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80442 (or 80437 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 405661450 is about 20141.0389503620. The cubic root of 405661450 is about 740.2661874126.

The spelling of 405661450 in words is "four hundred five million, six hundred sixty-one thousand, four hundred fifty".