3904981 has 2 divisors, whose sum is σ = 3904982. Its totient is φ = 3904980.

The previous prime is 3904973. The next prime is 3904997. The reversal of 3904981 is 1894093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3900625 + 4356 = 1975^2 + 66^2 .

It is a cyclic number.

It is not a de Polignac number, because 3904981 - 2³ = 3904973 is a prime.

It is a super-2 number, since 2×3904981² = 30497753220722, which contains 22 as substring.

3904981 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3904921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1952490 + 1952491.

It is an arithmetic number, because the mean of its divisors is an integer number (1952491).

Almost surely, 2^3904981 is an apocalyptic number.

It is an amenable number.

3904981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3904981 is an equidigital number, since it uses as much as digits as its factorization.

3904981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 3904981 is about 1976.1024770998. The cubic root of 3904981 is about 157.4730750984.

The spelling of 3904981 in words is "three million, nine hundred four thousand, nine hundred eighty-one".