3945881 has 8 divisors (see below), whose sum is σ = 4074504. Its totient is φ = 3818880.

The previous prime is 3945841. The next prime is 3945883. The reversal of 3945881 is 1885493.

It can be written as a sum of positive squares in 4 ways, for example, as 490000 + 3455881 = 700^2 + 1859^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3945881 is a prime.

It is a super-2 number, since 2×3945881² = 31139953732322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3945883) 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, 6131 + ... + 6743.

It is an arithmetic number, because the mean of its divisors is an integer number (509313).

Almost surely, 2^3945881 is an apocalyptic number.

It is an amenable number.

3945881 is a deficient number, since it is larger than the sum of its proper divisors (128623).

3945881 is a wasteful number, since it uses less digits than its factorization.

3945881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811.

The product of its digits is 34560, while the sum is 38.

The square root of 3945881 is about 1986.4241742387. The cubic root of 3945881 is about 158.0209473909.

The spelling of 3945881 in words is "three million, nine hundred forty-five thousand, eight hundred eighty-one".