990239490 has 24 divisors (see below), whose sum is σ = 2574622908. Its totient is φ = 264063840.

The previous prime is 990239441. The next prime is 990239491. The reversal of 990239490 is 94932099.

It can be written as a sum of positive squares in 2 ways, for example, as 987907761 + 2331729 = 31431^2 + 1527^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (990239491) 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, 5501241 + ... + 5501420.

Almost surely, 2^990239490 is an apocalyptic number.

990239490 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

990239490 is an abundant number, since it is smaller than the sum of its proper divisors (1584383418).

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

990239490 is a wasteful number, since it uses less digits than its factorization.

990239490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11002674 (or 11002671 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 990239490 is about 31468.0709608962. The cubic root of 990239490 is about 996.7358536078.

The spelling of 990239490 in words is "nine hundred ninety million, two hundred thirty-nine thousand, four hundred ninety".