991092040 has 16 divisors (see below), whose sum is σ = 2229957180. Its totient is φ = 396436800.

The previous prime is 991092029. The next prime is 991092043. The reversal of 991092040 is 40290199.

991092040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 933058116 + 58033924 = 30546^2 + 7618^2 .

It is a junction number, because it is equal to n+sod(n) for n = 991091987 and 991092005.

It is not an unprimeable number, because it can be changed into a prime (991092043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12388611 + ... + 12388690.

Almost surely, 2^991092040 is an apocalyptic number.

It is an amenable number.

991092040 is an abundant number, since it is smaller than the sum of its proper divisors (1238865140).

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

991092040 is a wasteful number, since it uses less digits than its factorization.

991092040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24777312 (or 24777308 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 991092040 is about 31481.6143169311. The cubic root of 991092040 is about 997.0218192444.

The spelling of 991092040 in words is "nine hundred ninety-one million, ninety-two thousand, forty".