405990423 has 12 divisors (see below), whose sum is σ = 617295640. Its totient is φ = 256414896.

The previous prime is 405990373. The next prime is 405990439. The reversal of 405990423 is 324099504.

405990423 is a `hidden beast` number, since 40 + 599 + 0 + 4 + 23 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-405990423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405990443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1186936 + ... + 1187277.

Almost surely, 2^405990423 is an apocalyptic number.

405990423 is a deficient number, since it is larger than the sum of its proper divisors (211305217).

405990423 is a wasteful number, since it uses less digits than its factorization.

405990423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2374238 (or 2374235 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 405990423 is about 20149.2040289437. The cubic root of 405990423 is about 740.4662407561.

The spelling of 405990423 in words is "four hundred five million, nine hundred ninety thousand, four hundred twenty-three".