3949685128 has 16 divisors (see below), whose sum is σ = 7509965760. Its totient is φ = 1947027600.

The previous prime is 3949685119. The next prime is 3949685137. The reversal of 3949685128 is 8215869493.

It is an interprime number because it is at equal distance from previous prime (3949685119) and next prime (3949685137).

It is a super-2 number, since 2×3949685128² = 31200025220688752768, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 3476268 + ... + 3477403.

It is an arithmetic number, because the mean of its divisors is an integer number (469372860).

Almost surely, 2^3949685128 is an apocalyptic number.

It is an amenable number.

3949685128 is a deficient number, since it is larger than the sum of its proper divisors (3560280632).

3949685128 is a wasteful number, since it uses less digits than its factorization.

3949685128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6953748 (or 6953744 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 55.

The square root of 3949685128 is about 62846.5204128279. The cubic root of 3949685128 is about 1580.7171246598.

The spelling of 3949685128 in words is "three billion, nine hundred forty-nine million, six hundred eighty-five thousand, one hundred twenty-eight".