3943917 has 24 divisors (see below), whose sum is σ = 6057600. Its totient is φ = 2535624.

The previous prime is 3943883. The next prime is 3943921. The reversal of 3943917 is 7193493.

It is not a de Polignac number, because 3943917 - 2⁶ = 3943853 is a prime.

3943917 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3943937) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49884 + ... + 49962.

It is an arithmetic number, because the mean of its divisors is an integer number (252400).

Almost surely, 2^3943917 is an apocalyptic number.

It is an amenable number.

3943917 is a deficient number, since it is larger than the sum of its proper divisors (2113683).

3943917 is an equidigital number, since it uses as much as digits as its factorization.

3943917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 125 counting only the distinct ones).

The product of its digits is 20412, while the sum is 36.

The square root of 3943917 is about 1985.9297570659. The cubic root of 3943917 is about 157.9947255623.

It can be divided in two parts, 39 and 43917, that added together give a triangular number (43956 = T₂₉₆).

The spelling of 3943917 in words is "three million, nine hundred forty-three thousand, nine hundred seventeen".