990455 has 4 divisors (see below), whose sum is σ = 1188552. Its totient is φ = 792360.

The previous prime is 990397. The next prime is 990463. The reversal of 990455 is 554099.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-990455 is a prime.

It is a super-2 number, since 2×990455² = 1962002214050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99041 + ... + 99050.

It is an arithmetic number, because the mean of its divisors is an integer number (297138).

2⁹⁹⁰⁴⁵⁵ is an apocalyptic number.

990455 is a deficient number, since it is larger than the sum of its proper divisors (198097).

990455 is a wasteful number, since it uses less digits than its factorization.

990455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198096.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 990455 is about 995.2160569444. The cubic root of 990455 is about 99.6808156307.

The spelling of 990455 in words is "nine hundred ninety thousand, four hundred fifty-five".