990554 has 4 divisors (see below), whose sum is σ = 1485834. Its totient is φ = 495276.

The previous prime is 990547. The next prime is 990559. The reversal of 990554 is 455099.

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

It can be written as a sum of positive squares in only one way, i.e., 990025 + 529 = 995^2 + 23^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 990554.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 990554.

It is not an unprimeable number, because it can be changed into a prime (990559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247637 + ... + 247640.

2⁹⁹⁰⁵⁵⁴ is an apocalyptic number.

990554 is a deficient number, since it is larger than the sum of its proper divisors (495280).

990554 is a wasteful number, since it uses less digits than its factorization.

990554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495279.

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

The square root of 990554 is about 995.2657936451. The cubic root of 990554 is about 99.6841366875.

The spelling of 990554 in words is "nine hundred ninety thousand, five hundred fifty-four".