3969157988 has 24 divisors (see below), whose sum is σ = 7420744800. Its totient is φ = 1852063488.

The previous prime is 3969157981. The next prime is 3969157991. The reversal of 3969157988 is 8897519693.

It is not an unprimeable number, because it can be changed into a prime (3969157981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 384653 + ... + 394836.

It is an arithmetic number, because the mean of its divisors is an integer number (309197700).

Almost surely, 2^3969157988 is an apocalyptic number.

3969157988 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

3969157988 is a deficient number, since it is larger than the sum of its proper divisors (3451586812).

3969157988 is a wasteful number, since it uses less digits than its factorization.

3969157988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779579 (or 779577 counting only the distinct ones).

The product of its digits is 29393280, while the sum is 65.

The square root of 3969157988 is about 63001.2538605384. The cubic root of 3969157988 is about 1583.3106339670.

It can be divided in two parts, 39691 and 57988, that added together give a palindrome (97679).

The spelling of 3969157988 in words is "three billion, nine hundred sixty-nine million, one hundred fifty-seven thousand, nine hundred eighty-eight".