990426 has 16 divisors (see below), whose sum is σ = 2067264. Its totient is φ = 315744.

The previous prime is 990397. The next prime is 990463. The reversal of 990426 is 624099.

It is a super-2 number, since 2×990426² = 1961887322952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 990393 and 990402.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3451 + ... + 3726.

It is an arithmetic number, because the mean of its divisors is an integer number (129204).

2⁹⁹⁰⁴²⁶ is an apocalyptic number.

990426 is an abundant number, since it is smaller than the sum of its proper divisors (1076838).

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

990426 is a wasteful number, since it uses less digits than its factorization.

990426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7205.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 990426 is about 995.2014871372. The cubic root of 990426 is about 99.6798427539.

The spelling of 990426 in words is "nine hundred ninety thousand, four hundred twenty-six".