3945115681 has 8 divisors (see below), whose sum is σ = 4282041344. Its totient is φ = 3612969360.

The previous prime is 3945115621. The next prime is 3945115709. The reversal of 3945115681 is 1865115493.

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

It is not a de Polignac number, because 3945115681 - 2⁷ = 3945115553 is a prime.

It is a super-2 number, since 2×3945115681² = 31127875472944187522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3945115621) 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, 1193115 + ... + 1196416.

It is an arithmetic number, because the mean of its divisors is an integer number (535255168).

Almost surely, 2^3945115681 is an apocalyptic number.

It is an amenable number.

3945115681 is a deficient number, since it is larger than the sum of its proper divisors (336925663).

3945115681 is a wasteful number, since it uses less digits than its factorization.

3945115681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2389671.

The product of its digits is 129600, while the sum is 43.

The square root of 3945115681 is about 62810.1558746673. The cubic root of 3945115681 is about 1580.1073047082.

The spelling of 3945115681 in words is "three billion, nine hundred forty-five million, one hundred fifteen thousand, six hundred eighty-one".