2391908939 has 4 divisors (see below), whose sum is σ = 2733610224. Its totient is φ = 2050207656.

The previous prime is 2391908867. The next prime is 2391908977. The reversal of 2391908939 is 9398091932.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2391908939 - 2¹² = 2391904843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2391908039) 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, 170850632 + ... + 170850645.

It is an arithmetic number, because the mean of its divisors is an integer number (683402556).

Almost surely, 2^2391908939 is an apocalyptic number.

2391908939 is a deficient number, since it is larger than the sum of its proper divisors (341701285).

2391908939 is an equidigital number, since it uses as much as digits as its factorization.

2391908939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341701284.

The product of its (nonzero) digits is 944784, while the sum is 53.

The square root of 2391908939 is about 48907.1460933880. The cubic root of 2391908939 is about 1337.3596443279.

The spelling of 2391908939 in words is "two billion, three hundred ninety-one million, nine hundred eight thousand, nine hundred thirty-nine".