3965687731 has 8 divisors (see below), whose sum is σ = 4064284224. Its totient is φ = 3867180480.

The previous prime is 3965687729. The next prime is 3965687743. The reversal of 3965687731 is 1377865693.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3965687731 - 2¹ = 3965687729 is a prime.

It is a super-2 number, since 2×3965687731² = 31453358359607856722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3965687701) 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, 72621 + ... + 114913.

It is an arithmetic number, because the mean of its divisors is an integer number (508035528).

Almost surely, 2^3965687731 is an apocalyptic number.

3965687731 is a deficient number, since it is larger than the sum of its proper divisors (98596493).

3965687731 is a wasteful number, since it uses less digits than its factorization.

3965687731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44621.

The product of its digits is 5715360, while the sum is 55.

The square root of 3965687731 is about 62973.7066639721. The cubic root of 3965687731 is about 1582.8490669802.

The spelling of 3965687731 in words is "three billion, nine hundred sixty-five million, six hundred eighty-seven thousand, seven hundred thirty-one".