3931745 has 4 divisors (see below), whose sum is σ = 4718100. Its totient is φ = 3145392.

The previous prime is 3931729. The next prime is 3931747. The reversal of 3931745 is 5471393.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 677329 + 3254416 = 823^2 + 1804^2 .

It is a cyclic number.

It is not a de Polignac number, because 3931745 - 2⁴ = 3931729 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (3931747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 393170 + ... + 393179.

It is an arithmetic number, because the mean of its divisors is an integer number (1179525).

Almost surely, 2^3931745 is an apocalyptic number.

It is an amenable number.

3931745 is a deficient number, since it is larger than the sum of its proper divisors (786355).

3931745 is an equidigital number, since it uses as much as digits as its factorization.

3931745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786354.

The product of its digits is 11340, while the sum is 32.

The square root of 3931745 is about 1982.8628293455. The cubic root of 3931745 is about 157.8320198382.

The spelling of 3931745 in words is "three million, nine hundred thirty-one thousand, seven hundred forty-five".