2181938008 has 32 divisors (see below), whose sum is σ = 4135179600. Its totient is φ = 1079252992.

The previous prime is 2181937957. The next prime is 2181938021. The reversal of 2181938008 is 8008391812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 835008 + ... + 837616.

Almost surely, 2^2181938008 is an apocalyptic number.

It is an amenable number.

2181938008 is a deficient number, since it is larger than the sum of its proper divisors (1953241592).

2181938008 is a wasteful number, since it uses less digits than its factorization.

2181938008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3699 (or 3695 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 2181938008 is about 46711.2192947262. The cubic root of 2181938008 is about 1297.0223779272.

The spelling of 2181938008 in words is "two billion, one hundred eighty-one million, nine hundred thirty-eight thousand, eight".