3991923960 has 64 divisors (see below), whose sum is σ = 12201749280. Its totient is φ = 1044426240.

The previous prime is 3991923889. The next prime is 3991923961. The reversal of 3991923960 is 693291993.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991923961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307471 + ... + 320190.

Almost surely, 2^3991923960 is an apocalyptic number.

3991923960 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3991923960 is an abundant number, since it is smaller than the sum of its proper divisors (8209825320).

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

3991923960 is a wasteful number, since it uses less digits than its factorization.

3991923960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627728 (or 627724 counting only the distinct ones).

The product of its (nonzero) digits is 708588, while the sum is 51.

The square root of 3991923960 is about 63181.6742418243. The cubic root of 3991923960 is about 1586.3320059742.

The spelling of 3991923960 in words is "three billion, nine hundred ninety-one million, nine hundred twenty-three thousand, nine hundred sixty".