405885990 has 16 divisors (see below), whose sum is σ = 974126448. Its totient is φ = 108236256.

The previous prime is 405885979. The next prime is 405886043. The reversal of 405885990 is 99588504.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6764737 + ... + 6764796.

It is an arithmetic number, because the mean of its divisors is an integer number (60882903).

Almost surely, 2^405885990 is an apocalyptic number.

405885990 is an abundant number, since it is smaller than the sum of its proper divisors (568240458).

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

405885990 is a wasteful number, since it uses less digits than its factorization.

405885990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13529543.

The product of its (nonzero) digits is 518400, while the sum is 48.

The square root of 405885990 is about 20146.6123703217. The cubic root of 405885990 is about 740.4027452170.

The spelling of 405885990 in words is "four hundred five million, eight hundred eighty-five thousand, nine hundred ninety".