3943491 has 4 divisors (see below), whose sum is σ = 5257992. Its totient is φ = 2628992.

The previous prime is 3943481. The next prime is 3943517. The reversal of 3943491 is 1943493.

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

It is a cyclic number.

It is not a de Polignac number, because 3943491 - 2⁶ = 3943427 is a prime.

It is a super-2 number, since 2×3943491² = 31102242534162, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (3943451) 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, 657246 + ... + 657251.

It is an arithmetic number, because the mean of its divisors is an integer number (1314498).

Almost surely, 2^3943491 is an apocalyptic number.

3943491 is a deficient number, since it is larger than the sum of its proper divisors (1314501).

3943491 is a wasteful number, since it uses less digits than its factorization.

3943491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1314500.

The product of its digits is 11664, while the sum is 33.

The square root of 3943491 is about 1985.8224996207. The cubic root of 3943491 is about 157.9890367867.

The spelling of 3943491 in words is "three million, nine hundred forty-three thousand, four hundred ninety-one".