990440 has 32 divisors (see below), whose sum is σ = 2432160. Its totient is φ = 360000.

The previous prime is 990397. The next prime is 990463. The reversal of 990440 is 44099.

990440 = T₂₈₉ + T₂₉₀ + ... + T₃₁₀.

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, 686 + ... + 1565.

It is an arithmetic number, because the mean of its divisors is an integer number (76005).

2⁹⁹⁰⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

990440 is an abundant number, since it is smaller than the sum of its proper divisors (1441720).

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

990440 is a wasteful number, since it uses less digits than its factorization.

990440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2273 (or 2269 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 990440 is about 995.2085208638. The cubic root of 990440 is about 99.6803124209.

It can be divided in two parts, 990 and 440, that multiplied together give a square (435600 = 660²).

The spelling of 990440 in words is "nine hundred ninety thousand, four hundred forty".