2391042690 has 96 divisors (see below), whose sum is σ = 6648001776. Its totient is φ = 594124800.

The previous prime is 2391042683. The next prime is 2391042691. The reversal of 2391042690 is 962401932.

2391042690 is a `hidden beast` number, since 2 + 391 + 0 + 4 + 269 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 1930811481 + 460231209 = 43941^2 + 21453^2 .

It is a super-2 number, since 2×2391042690² = 11434170290804872200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2391042691) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 146794 + ... + 162266.

Almost surely, 2^2391042690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2391042690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3324000888).

2391042690 is an abundant number, since it is smaller than the sum of its proper divisors (4256959086).

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

2391042690 is a wasteful number, since it uses less digits than its factorization.

2391042690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15604 (or 15601 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 2391042690 is about 48898.2892338781. The cubic root of 2391042690 is about 1337.1981796618.

The spelling of 2391042690 in words is "two billion, three hundred ninety-one million, forty-two thousand, six hundred ninety".