991792 has 10 divisors (see below), whose sum is σ = 1921628. Its totient is φ = 495888.

The previous prime is 991777. The next prime is 991811. The reversal of 991792 is 297199.

It is an unprimeable number.

991792 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30978 + ... + 31009.

2⁹⁹¹⁷⁹² is an apocalyptic number.

It is an amenable number.

991792 is a deficient number, since it is larger than the sum of its proper divisors (929836).

991792 is a wasteful number, since it uses less digits than its factorization.

991792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61995 (or 61989 counting only the distinct ones).

The product of its digits is 10206, while the sum is 37.

The square root of 991792 is about 995.8875438522. The cubic root of 991792 is about 99.7256479981.

It can be divided in two parts, 99 and 1792, that added together give a triangular number (1891 = T₆₁).

The spelling of 991792 in words is "nine hundred ninety-one thousand, seven hundred ninety-two".