3994491 has 4 divisors (see below), whose sum is σ = 5325992. Its totient is φ = 2662992.

The previous prime is 3994481. The next prime is 3994493. The reversal of 3994491 is 1944993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1944993 = 3 ⋅648331.

It is not a de Polignac number, because 3994491 - 2¹⁵ = 3961723 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3994493) 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, 665746 + ... + 665751.

It is an arithmetic number, because the mean of its divisors is an integer number (1331498).

Almost surely, 2^3994491 is an apocalyptic number.

3994491 is a deficient number, since it is larger than the sum of its proper divisors (1331501).

3994491 is a wasteful number, since it uses less digits than its factorization.

3994491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331500.

The product of its digits is 34992, while the sum is 39.

The square root of 3994491 is about 1998.6222754688. The cubic root of 3994491 is about 158.6671967789.

The spelling of 3994491 in words is "three million, nine hundred ninety-four thousand, four hundred ninety-one".