3971636975 has 24 divisors (see below), whose sum is σ = 5201906640. Its totient is φ = 2999704320.

The previous prime is 3971636959. The next prime is 3971636989. The reversal of 3971636975 is 5796361793.

It is a happy number.

It is not a de Polignac number, because 3971636975 - 2⁴ = 3971636959 is a prime.

It is a super-2 number, since 2×3971636975² = 31547800522374301250, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3971636975.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124907 + ... + 153443.

It is an arithmetic number, because the mean of its divisors is an integer number (216746110).

Almost surely, 2^3971636975 is an apocalyptic number.

3971636975 is a deficient number, since it is larger than the sum of its proper divisors (1230269665).

3971636975 is a wasteful number, since it uses less digits than its factorization.

3971636975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28859 (or 28854 counting only the distinct ones).

The product of its digits is 6429780, while the sum is 56.

The square root of 3971636975 is about 63020.9248980051. The cubic root of 3971636975 is about 1583.6401908181.

The spelling of 3971636975 in words is "three billion, nine hundred seventy-one million, six hundred thirty-six thousand, nine hundred seventy-five".