9991492 has 36 divisors (see below), whose sum is σ = 21418320. Its totient is φ = 4055184.

The previous prime is 9991489. The next prime is 9991543. The reversal of 9991492 is 2941999.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2383 + ... + 5065.

Almost surely, 2^9991492 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 9991492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10709160).

9991492 is an abundant number, since it is smaller than the sum of its proper divisors (11426828).

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

9991492 is a wasteful number, since it uses less digits than its factorization.

9991492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2720 (or 2711 counting only the distinct ones).

The product of its digits is 52488, while the sum is 43.

The square root of 9991492 is about 3160.9321409989. The cubic root of 9991492 is about 215.3823518993.

The spelling of 9991492 in words is "nine million, nine hundred ninety-one thousand, four hundred ninety-two".