3945931 has 6 divisors (see below), whose sum is σ = 4337396. Its totient is φ = 3587100.

The previous prime is 3945923. The next prime is 3945937. The reversal of 3945931 is 1395493.

It is not a de Polignac number, because 3945931 - 2³ = 3945923 is a prime.

It is a super-4 number, since 4×3945931⁴ (a number of 27 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

3945931 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3945937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16185 + ... + 16426.

Almost surely, 2^3945931 is an apocalyptic number.

3945931 is a deficient number, since it is larger than the sum of its proper divisors (391465).

3945931 is a wasteful number, since it uses less digits than its factorization.

3945931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32633 (or 32622 counting only the distinct ones).

The product of its digits is 14580, while the sum is 34.

The square root of 3945931 is about 1986.4367596277. The cubic root of 3945931 is about 158.0216148392.

The spelling of 3945931 in words is "three million, nine hundred forty-five thousand, nine hundred thirty-one".