3966257 has 4 divisors (see below), whose sum is σ = 3971136. Its totient is φ = 3961380.

The previous prime is 3966247. The next prime is 3966271. The reversal of 3966257 is 7526693.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7526693 = 1997 ⋅3769.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3966257 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 3966257.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3966247) 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, 893 + ... + 2954.

It is an arithmetic number, because the mean of its divisors is an integer number (992784).

Almost surely, 2^3966257 is an apocalyptic number.

It is an amenable number.

3966257 is a deficient number, since it is larger than the sum of its proper divisors (4879).

3966257 is a wasteful number, since it uses less digits than its factorization.

3966257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4878.

The product of its digits is 68040, while the sum is 38.

The square root of 3966257 is about 1991.5463840945. The cubic root of 3966257 is about 158.2924801956.

The spelling of 3966257 in words is "three million, nine hundred sixty-six thousand, two hundred fifty-seven".