2391091388 has 24 divisors (see below), whose sum is σ = 4787684832. Its totient is φ = 1023574464.

The previous prime is 2391091387. The next prime is 2391091399. The reversal of 2391091388 is 8831901932.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2391091387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24131 + ... + 73242.

It is an arithmetic number, because the mean of its divisors is an integer number (199486868).

Almost surely, 2^2391091388 is an apocalyptic number.

2391091388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2391091388 is an abundant number, since it is smaller than the sum of its proper divisors (2396593444).

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

2391091388 is a wasteful number, since it uses less digits than its factorization.

2391091388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98261 (or 98259 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 2391091388 is about 48898.7871833239. The cubic root of 2391091388 is about 1337.2072577703.

The spelling of 2391091388 in words is "two billion, three hundred ninety-one million, ninety-one thousand, three hundred eighty-eight".