3997156172 has 24 divisors (see below), whose sum is σ = 7241739456. Its totient is φ = 1929253248.

The previous prime is 3997156147. The next prime is 3997156181. The reversal of 3997156172 is 2716517993.

It is a self number, because there is not a number n which added to its sum of digits gives 3997156172.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131903 + ... + 159350.

It is an arithmetic number, because the mean of its divisors is an integer number (301739144).

Almost surely, 2^3997156172 is an apocalyptic number.

It is an amenable number.

3997156172 is a deficient number, since it is larger than the sum of its proper divisors (3244583284).

3997156172 is a wasteful number, since it uses less digits than its factorization.

3997156172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291377 (or 291375 counting only the distinct ones).

The product of its digits is 714420, while the sum is 50.

The square root of 3997156172 is about 63223.0667715510. The cubic root of 3997156172 is about 1587.0247714845.

The spelling of 3997156172 in words is "three billion, nine hundred ninety-seven million, one hundred fifty-six thousand, one hundred seventy-two".