3943657 has 4 divisors (see below), whose sum is σ = 3949456. Its totient is φ = 3937860.

The previous prime is 3943651. The next prime is 3943661. The reversal of 3943657 is 7563493.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3943657 - 2⁷ = 3943529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3943651) 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, 1719 + ... + 3292.

It is an arithmetic number, because the mean of its divisors is an integer number (987364).

Almost surely, 2^3943657 is an apocalyptic number.

It is an amenable number.

3943657 is a deficient number, since it is larger than the sum of its proper divisors (5799).

3943657 is an equidigital number, since it uses as much as digits as its factorization.

3943657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5798.

The product of its digits is 68040, while the sum is 37.

The square root of 3943657 is about 1985.8642954643. The cubic root of 3943657 is about 157.9912535884.

It can be divided in two parts, 39436 and 57, that added together give a palindrome (39493).

The spelling of 3943657 in words is "three million, nine hundred forty-three thousand, six hundred fifty-seven".