405108990 has 96 divisors (see below), whose sum is σ = 1237463136. Its totient is φ = 90650880.

The previous prime is 405108943. The next prime is 405109007. The reversal of 405108990 is 99801504.

It is a super-2 number, since 2×405108990² = 328226587557640200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2869 + ... + 28608.

It is an arithmetic number, because the mean of its divisors is an integer number (12890241).

Almost surely, 2^405108990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 405108990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (618731568).

405108990 is an abundant number, since it is smaller than the sum of its proper divisors (832354146).

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

405108990 is a wasteful number, since it uses less digits than its factorization.

405108990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31514 (or 31511 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 405108990 is about 20127.3194936633. The cubic root of 405108990 is about 739.9299848537.

The spelling of 405108990 in words is "four hundred five million, one hundred eight thousand, nine hundred ninety".