990602 has 4 divisors (see below), whose sum is σ = 1485906. Its totient is φ = 495300.

The previous prime is 990599. The next prime is 990631. The reversal of 990602 is 206099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 206099 = 43 ⋅4793.

It can be written as a sum of positive squares in only one way, i.e., 923521 + 67081 = 961^2 + 259^2 .

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 as a sum of consecutive naturals, namely, 247649 + ... + 247652.

2⁹⁹⁰⁶⁰² is an apocalyptic number.

990602 is a deficient number, since it is larger than the sum of its proper divisors (495304).

990602 is a wasteful number, since it uses less digits than its factorization.

990602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495303.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 990602 is about 995.2899075144. The cubic root of 990602 is about 99.6857468172.

The spelling of 990602 in words is "nine hundred ninety thousand, six hundred two".