1931965140 has 72 divisors (see below), whose sum is σ = 6292696032. Its totient is φ = 441591360.

The previous prime is 1931965073. The next prime is 1931965157. The reversal of 1931965140 is 415691391.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 325626 + ... + 331505.

It is an arithmetic number, because the mean of its divisors is an integer number (87398556).

Almost surely, 2^1931965140 is an apocalyptic number.

1931965140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1931965140 is an abundant number, since it is smaller than the sum of its proper divisors (4360730892).

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

1931965140 is a wasteful number, since it uses less digits than its factorization.

1931965140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657157 (or 657148 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 39.

The square root of 1931965140 is about 43954.1254036524. The cubic root of 1931965140 is about 1245.4694959981.

The spelling of 1931965140 in words is "one billion, nine hundred thirty-one million, nine hundred sixty-five thousand, one hundred forty".