991793292 has 96 divisors (see below), whose sum is σ = 2752512000. Its totient is φ = 271978560.

The previous prime is 991793291. The next prime is 991793317. The reversal of 991793292 is 292397199.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (991793291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 329209 + ... + 332207.

It is an arithmetic number, because the mean of its divisors is an integer number (28672000).

Almost surely, 2^991793292 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991793292, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1376256000).

991793292 is an abundant number, since it is smaller than the sum of its proper divisors (1760718708).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991793292 is a wasteful number, since it uses less digits than its factorization.

991793292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3171 (or 3169 counting only the distinct ones).

The product of its digits is 551124, while the sum is 51.

The square root of 991793292 is about 31492.7498323027. The cubic root of 991793292 is about 997.2569130206.

The spelling of 991793292 in words is "nine hundred ninety-one million, seven hundred ninety-three thousand, two hundred ninety-two".