3994991 has 24 divisors (see below), whose sum is σ = 5410944. Its totient is φ = 2864160.

The previous prime is 3994961. The next prime is 3994993. The reversal of 3994991 is 1994993.

It is a de Polignac number, because none of the positive numbers 2^k-3994991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3994993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12860 + ... + 13166.

It is an arithmetic number, because the mean of its divisors is an integer number (225456).

Almost surely, 2^3994991 is an apocalyptic number.

3994991 is a deficient number, since it is larger than the sum of its proper divisors (1415953).

3994991 is a wasteful number, since it uses less digits than its factorization.

3994991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351 (or 338 counting only the distinct ones).

The product of its digits is 78732, while the sum is 44.

The square root of 3994991 is about 1998.7473577218. The cubic root of 3994991 is about 158.6738167536.

The spelling of 3994991 in words is "three million, nine hundred ninety-four thousand, nine hundred ninety-one".