3973657 has 4 divisors (see below), whose sum is σ = 4029696. Its totient is φ = 3917620.

The previous prime is 3973649. The next prime is 3973661. The reversal of 3973657 is 7563793.

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 an emirpimes, since its reverse is a distinct semiprime: 7563793 = 17 ⋅444929.

It is a cyclic number.

It is not a de Polignac number, because 3973657 - 2³ = 3973649 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3973757) 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, 27913 + ... + 28054.

It is an arithmetic number, because the mean of its divisors is an integer number (1007424).

Almost surely, 2^3973657 is an apocalyptic number.

It is an amenable number.

3973657 is a deficient number, since it is larger than the sum of its proper divisors (56039).

3973657 is an equidigital number, since it uses as much as digits as its factorization.

3973657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56038.

The product of its digits is 119070, while the sum is 40.

The square root of 3973657 is about 1993.4033711219. The cubic root of 3973657 is about 158.3908631816.

It can be divided in two parts, 39736 and 57, that added together give a palindrome (39793).

The spelling of 3973657 in words is "three million, nine hundred seventy-three thousand, six hundred fifty-seven".