2108408391 has 24 divisors (see below), whose sum is σ = 3293244864. Its totient is φ = 1294771200.

The previous prime is 2108408371. The next prime is 2108408437. The reversal of 2108408391 is 1938048012.

2108408391 is a `hidden beast` number, since 210 + 8 + 408 + 39 + 1 = 666.

It is not a de Polignac number, because 2108408391 - 2⁹ = 2108407879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2108408371) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 139410 + ... + 153791.

It is an arithmetic number, because the mean of its divisors is an integer number (137218536).

Almost surely, 2^2108408391 is an apocalyptic number.

2108408391 is a deficient number, since it is larger than the sum of its proper divisors (1184836473).

2108408391 is a wasteful number, since it uses less digits than its factorization.

2108408391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293271 (or 293268 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 2108408391 is about 45917.4083654555. The cubic root of 2108408391 is about 1282.2860334086.

The spelling of 2108408391 in words is "two billion, one hundred eight million, four hundred eight thousand, three hundred ninety-one".