3893981 has 12 divisors (see below), whose sum is σ = 4878972. Its totient is φ = 3080448.

The previous prime is 3893977. The next prime is 3893983. The reversal of 3893981 is 1893983.

It can be written as a sum of positive squares in 2 ways, for example, as 1301881 + 2592100 = 1141^2 + 1610^2 .

It is not a de Polignac number, because 3893981 - 2² = 3893977 is a prime.

It is a super-2 number, since 2×3893981² = 30326176056722, 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 (3893983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2420 + ... + 3693.

It is an arithmetic number, because the mean of its divisors is an integer number (406581).

Almost surely, 2^3893981 is an apocalyptic number.

It is an amenable number.

3893981 is a deficient number, since it is larger than the sum of its proper divisors (984991).

3893981 is a wasteful number, since it uses less digits than its factorization.

3893981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6140 (or 6133 counting only the distinct ones).

The product of its digits is 46656, while the sum is 41.

The square root of 3893981 is about 1973.3172578174. The cubic root of 3893981 is about 157.3250732800.

The spelling of 3893981 in words is "three million, eight hundred ninety-three thousand, nine hundred eighty-one".