3931945 has 8 divisors (see below), whose sum is σ = 4729536. Its totient is φ = 3138096.

The previous prime is 3931943. The next prime is 3931969. The reversal of 3931945 is 5491393.

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 3931945 - 2¹ = 3931943 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3931945.

It is not an unprimeable number, because it can be changed into a prime (3931943) 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, 2604 + ... + 3826.

It is an arithmetic number, because the mean of its divisors is an integer number (591192).

Almost surely, 2^3931945 is an apocalyptic number.

It is an amenable number.

3931945 is a deficient number, since it is larger than the sum of its proper divisors (797591).

3931945 is a wasteful number, since it uses less digits than its factorization.

3931945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1871.

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

The square root of 3931945 is about 1982.9132608362. The cubic root of 3931945 is about 157.8346959925.

The spelling of 3931945 in words is "three million, nine hundred thirty-one thousand, nine hundred forty-five".