3907721988 has 144 divisors (see below), whose sum is σ = 10930308480. Its totient is φ = 1205012160.

The previous prime is 3907721981. The next prime is 3907721989. The reversal of 3907721988 is 8891277093.

It is a super-2 number, since 2×3907721988² = 30540582270997344288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (3907721981) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2386306 + ... + 2387942.

It is an arithmetic number, because the mean of its divisors is an integer number (75904920).

Almost surely, 2^3907721988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3907721988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5465154240).

3907721988 is an abundant number, since it is smaller than the sum of its proper divisors (7022586492).

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

3907721988 is a wasteful number, since it uses less digits than its factorization.

3907721988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1735 (or 1696 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The square root of 3907721988 is about 62511.7747948337. The cubic root of 3907721988 is about 1575.0991103164.

The spelling of 3907721988 in words is "three billion, nine hundred seven million, seven hundred twenty-one thousand, nine hundred eighty-eight".