3969128 has 16 divisors (see below), whose sum is σ = 7624260. Its totient is φ = 1936000.

The previous prime is 3969071. The next prime is 3969137. The reversal of 3969128 is 8219693.

It can be written as a sum of positive squares in 2 ways, for example, as 3928324 + 40804 = 1982^2 + 202^2 .

It is a super-3 number, since 3×3969128³ (a number of 21 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3969091 and 3969100.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5723 + ... + 6378.

Almost surely, 2^3969128 is an apocalyptic number.

It is an amenable number.

3969128 is a deficient number, since it is larger than the sum of its proper divisors (3655132).

3969128 is a wasteful number, since it uses less digits than its factorization.

3969128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12148 (or 12144 counting only the distinct ones).

The product of its digits is 23328, while the sum is 38.

The square root of 3969128 is about 1992.2670503725. The cubic root of 3969128 is about 158.3306646518.

The spelling of 3969128 in words is "three million, nine hundred sixty-nine thousand, one hundred twenty-eight".