3841893981 has 6 divisors (see below), whose sum is σ = 5549402430. Its totient is φ = 2561262648.

The previous prime is 3841893977. The next prime is 3841893989. The reversal of 3841893981 is 1893981483.

3841893981 is a `hidden beast` number, since 384 + 189 + 3 + 9 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3824804025 + 17089956 = 61845^2 + 4134^2 .

It is not a de Polignac number, because 3841893981 - 2² = 3841893977 is a prime.

It is a super-2 number, since 2×3841893981² = 29520298722488056722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3841893989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 213438546 + ... + 213438563.

It is an arithmetic number, because the mean of its divisors is an integer number (924900405).

Almost surely, 2^3841893981 is an apocalyptic number.

It is an amenable number.

3841893981 is a deficient number, since it is larger than the sum of its proper divisors (1707508449).

3841893981 is a wasteful number, since it uses less digits than its factorization.

3841893981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426877115 (or 426877112 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 54.

The square root of 3841893981 is about 61983.0136489022. The cubic root of 3841893981 is about 1566.2044684894.

The spelling of 3841893981 in words is "three billion, eight hundred forty-one million, eight hundred ninety-three thousand, nine hundred eighty-one".