3942981 has 18 divisors (see below), whose sum is σ = 6626022. Its totient is φ = 2252880.

The previous prime is 3942977. The next prime is 3942989. The reversal of 3942981 is 1892493.

It can be written as a sum of positive squares in only one way, i.e., 3572100 + 370881 = 1890^2 + 609^2 .

It is not a de Polignac number, because 3942981 - 2² = 3942977 is a prime.

It is a super-2 number, since 2×3942981² = 31094198332722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3942989) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4030 + ... + 4911.

Almost surely, 2^3942981 is an apocalyptic number.

It is an amenable number.

3942981 is a deficient number, since it is larger than the sum of its proper divisors (2683041).

3942981 is a wasteful number, since it uses less digits than its factorization.

3942981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8961 (or 8951 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 3942981 is about 1985.6940852004. The cubic root of 3942981 is about 157.9822257418.

It can be divided in two parts, 394 and 2981, that added together give a cube (3375 = 15³).

The spelling of 3942981 in words is "three million, nine hundred forty-two thousand, nine hundred eighty-one".