3943997 has 4 divisors (see below), whose sum is σ = 3969276. Its totient is φ = 3918720.

The previous prime is 3943993. The next prime is 3943999. The reversal of 3943997 is 7993493.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1466521 + 2477476 = 1211^2 + 1574^2 .

It is not a de Polignac number, because 3943997 - 2² = 3943993 is a prime.

It is a super-2 number, since 2×3943997² = 31110224672018, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3943993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12404 + ... + 12717.

It is an arithmetic number, because the mean of its divisors is an integer number (992319).

Almost surely, 2^3943997 is an apocalyptic number.

It is an amenable number.

3943997 is a deficient number, since it is larger than the sum of its proper divisors (25279).

3943997 is a wasteful number, since it uses less digits than its factorization.

3943997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25278.

The product of its digits is 183708, while the sum is 44.

The square root of 3943997 is about 1985.9498986631. The cubic root of 3943997 is about 157.9957938313.

The spelling of 3943997 in words is "three million, nine hundred forty-three thousand, nine hundred ninety-seven".