3997491 has 8 divisors (see below), whose sum is σ = 5443584. Its totient is φ = 2608200.

The previous prime is 3997471. The next prime is 3997493. The reversal of 3997491 is 1947993.

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

It is not a de Polignac number, because 3997491 - 2¹⁰ = 3996467 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (3997493) 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, 14035 + ... + 14316.

It is an arithmetic number, because the mean of its divisors is an integer number (680448).

Almost surely, 2^3997491 is an apocalyptic number.

3997491 is a deficient number, since it is larger than the sum of its proper divisors (1446093).

3997491 is a wasteful number, since it uses less digits than its factorization.

3997491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28401.

The product of its digits is 61236, while the sum is 42.

The square root of 3997491 is about 1999.3726516085. The cubic root of 3997491 is about 158.7069083446.

The spelling of 3997491 in words is "three million, nine hundred ninety-seven thousand, four hundred ninety-one".