3945831 has 12 divisors (see below), whose sum is σ = 5359032. Its totient is φ = 2582448.

The previous prime is 3945803. The next prime is 3945841. The reversal of 3945831 is 1385493.

It is not a de Polignac number, because 3945831 - 2⁷ = 3945703 is a prime.

It is a super-2 number, since 2×3945831² = 31139164561122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3945792 and 3945801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3945841) 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 11 ways as a sum of consecutive naturals, for example, 13321 + ... + 13613.

It is an arithmetic number, because the mean of its divisors is an integer number (446586).

Almost surely, 2^3945831 is an apocalyptic number.

3945831 is a deficient number, since it is larger than the sum of its proper divisors (1413201).

3945831 is an equidigital number, since it uses as much as digits as its factorization.

3945831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430 (or 363 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 3945831 is about 1986.4115887701. The cubic root of 3945831 is about 158.0202799371.

The spelling of 3945831 in words is "three million, nine hundred forty-five thousand, eight hundred thirty-one".