3969992640 has 112 divisors (see below), whose sum is σ = 12617256960. Its totient is φ = 1057612800.

The previous prime is 3969992633. The next prime is 3969992657. The reversal of 3969992640 is 462999693.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1687465 + ... + 1689815.

It is an arithmetic number, because the mean of its divisors is an integer number (112654080).

Almost surely, 2^3969992640 is an apocalyptic number.

3969992640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3969992640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6308628480).

3969992640 is an abundant number, since it is smaller than the sum of its proper divisors (8647264320).

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

3969992640 is a wasteful number, since it uses less digits than its factorization.

3969992640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4130 (or 4120 counting only the distinct ones).

The product of its (nonzero) digits is 5668704, while the sum is 57.

The square root of 3969992640 is about 63007.8776027252. The cubic root of 3969992640 is about 1583.4216080301.

The spelling of 3969992640 in words is "three billion, nine hundred sixty-nine million, nine hundred ninety-two thousand, six hundred forty".