990742 has 4 divisors (see below), whose sum is σ = 1486116. Its totient is φ = 495370.

The previous prime is 990733. The next prime is 990761. The reversal of 990742 is 247099.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 as a sum of consecutive naturals, namely, 247684 + ... + 247687.

It is an arithmetic number, because the mean of its divisors is an integer number (371529).

2⁹⁹⁰⁷⁴² is an apocalyptic number.

990742 is a deficient number, since it is larger than the sum of its proper divisors (495374).

990742 is a wasteful number, since it uses less digits than its factorization.

990742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495373.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 990742 is about 995.3602362964. The cubic root of 990742 is about 99.6904427318.

The spelling of 990742 in words is "nine hundred ninety thousand, seven hundred forty-two".