3994581 has 4 divisors (see below), whose sum is σ = 5326112. Its totient is φ = 2663052.

The previous prime is 3994561. The next prime is 3994591. The reversal of 3994581 is 1854993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3994581 - 2⁷ = 3994453 is a prime.

It is a super-2 number, since 2×3994581² = 31913354731122, which contains 22 as substring.

It is a D-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 (3994561) 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, 665761 + ... + 665766.

It is an arithmetic number, because the mean of its divisors is an integer number (1331528).

Almost surely, 2^3994581 is an apocalyptic number.

It is an amenable number.

3994581 is a deficient number, since it is larger than the sum of its proper divisors (1331531).

3994581 is a wasteful number, since it uses less digits than its factorization.

3994581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331530.

The product of its digits is 38880, while the sum is 39.

The square root of 3994581 is about 1998.6447908520. The cubic root of 3994581 is about 158.6683884151.

The spelling of 3994581 in words is "three million, nine hundred ninety-four thousand, five hundred eighty-one".