3993657 has 8 divisors (see below), whose sum is σ = 5638176. Its totient is φ = 2505792.

The previous prime is 3993653. The next prime is 3993659. The reversal of 3993657 is 7563993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3993657 - 2² = 3993653 is a prime.

3993657 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3993653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39103 + ... + 39204.

It is an arithmetic number, because the mean of its divisors is an integer number (704772).

Almost surely, 2^3993657 is an apocalyptic number.

It is an amenable number.

3993657 is a deficient number, since it is larger than the sum of its proper divisors (1644519).

3993657 is a wasteful number, since it uses less digits than its factorization.

3993657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78327.

The product of its digits is 153090, while the sum is 42.

The square root of 3993657 is about 1998.4136208503. The cubic root of 3993657 is about 158.6561534317.

It can be divided in two parts, 39936 and 57, that added together give a palindrome (39993).

The spelling of 3993657 in words is "three million, nine hundred ninety-three thousand, six hundred fifty-seven".