3994981 has 4 divisors (see below), whose sum is σ = 4070412. Its totient is φ = 3919552.

The previous prime is 3994961. The next prime is 3994993. The reversal of 3994981 is 1894993.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3272481 + 722500 = 1809^2 + 850^2 .

It is a cyclic number.

It is not a de Polignac number, because 3994981 - 2¹⁵ = 3962213 is a prime.

It is a super-2 number, since 2×3994981² = 31919746380722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3994931) 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, 37636 + ... + 37741.

It is an arithmetic number, because the mean of its divisors is an integer number (1017603).

Almost surely, 2^3994981 is an apocalyptic number.

It is an amenable number.

3994981 is a deficient number, since it is larger than the sum of its proper divisors (75431).

3994981 is an equidigital number, since it uses as much as digits as its factorization.

3994981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75430.

The product of its digits is 69984, while the sum is 43.

The square root of 3994981 is about 1998.7448561535. The cubic root of 3994981 is about 158.6736843596.

The spelling of 3994981 in words is "three million, nine hundred ninety-four thousand, nine hundred eighty-one".