990478 has 16 divisors (see below), whose sum is σ = 1560384. Its totient is φ = 471040.

The previous prime is 990469. The next prime is 990487. The reversal of 990478 is 874099.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (990469) and next prime (990487).

It is a congruent number.

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, 3726 + ... + 3982.

It is an arithmetic number, because the mean of its divisors is an integer number (97524).

2⁹⁹⁰⁴⁷⁸ is an apocalyptic number.

990478 is a deficient number, since it is larger than the sum of its proper divisors (569906).

990478 is a wasteful number, since it uses less digits than its factorization.

990478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 990478 is about 995.2276121571. The cubic root of 990478 is about 99.6815872090.

The spelling of 990478 in words is "nine hundred ninety thousand, four hundred seventy-eight".