990489946 has 8 divisors (see below), whose sum is σ = 1486095444. Its totient is φ = 495124800.

The previous prime is 990489919. The next prime is 990489947. The reversal of 990489946 is 649984099.

It can be written as a sum of positive squares in 2 ways, for example, as 788991921 + 201498025 = 28089^2 + 14195^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (990489947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49405 + ... + 66496.

Almost surely, 2^990489946 is an apocalyptic number.

990489946 is a deficient number, since it is larger than the sum of its proper divisors (495605498).

990489946 is a wasteful number, since it uses less digits than its factorization.

990489946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120176.

The product of its (nonzero) digits is 5038848, while the sum is 58.

The square root of 990489946 is about 31472.0502350895. The cubic root of 990489946 is about 996.8198795543.

The spelling of 990489946 in words is "nine hundred ninety million, four hundred eighty-nine thousand, nine hundred forty-six".