1931921892 has 36 divisors (see below), whose sum is σ = 5095796160. Its totient is φ = 615974832.

The previous prime is 1931921879. The next prime is 1931921909. The reversal of 1931921892 is 2981291391.

1931921892 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1165792 + ... + 1167447.

Almost surely, 2^1931921892 is an apocalyptic number.

1931921892 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1931921892 is an abundant number, since it is smaller than the sum of its proper divisors (3163874268).

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

1931921892 is a wasteful number, since it uses less digits than its factorization.

1931921892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2333272 (or 2333267 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 1931921892 is about 43953.6334334262. The cubic root of 1931921892 is about 1245.4602024442.

The spelling of 1931921892 in words is "one billion, nine hundred thirty-one million, nine hundred twenty-one thousand, eight hundred ninety-two".