1905139992 has 64 divisors (see below), whose sum is σ = 5554368000. Its totient is φ = 544323360.

The previous prime is 1905139991. The next prime is 1905140009. The reversal of 1905139992 is 2999315091.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1905139991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107484 + ... + 123947.

It is an arithmetic number, because the mean of its divisors is an integer number (86787000).

Almost surely, 2^1905139992 is an apocalyptic number.

1905139992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1905139992 is an abundant number, since it is smaller than the sum of its proper divisors (3649228008).

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

1905139992 is a wasteful number, since it uses less digits than its factorization.

1905139992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231461 (or 231443 counting only the distinct ones).

The product of its (nonzero) digits is 196830, while the sum is 48.

The square root of 1905139992 is about 43647.9093657417. The cubic root of 1905139992 is about 1239.6782012684.

The spelling of 1905139992 in words is "one billion, nine hundred five million, one hundred thirty-nine thousand, nine hundred ninety-two".