381873681 has 12 divisors (see below), whose sum is σ = 630394752. Its totient is φ = 218213496.

The previous prime is 381873677. The next prime is 381873683. The reversal of 381873681 is 186378183.

It is not a de Polignac number, because 381873681 - 2² = 381873677 is a prime.

It is a super-2 number, since 2×381873681² = 291655016480979522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (381873683) 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, 3030681 + ... + 3030806.

It is an arithmetic number, because the mean of its divisors is an integer number (52532896).

Almost surely, 2^381873681 is an apocalyptic number.

It is an amenable number.

381873681 is a deficient number, since it is larger than the sum of its proper divisors (248521071).

381873681 is a wasteful number, since it uses less digits than its factorization.

381873681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6061500 (or 6061497 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 381873681 is about 19541.5884973561. The cubic root of 381873681 is about 725.5041636327.

The spelling of 381873681 in words is "three hundred eighty-one million, eight hundred seventy-three thousand, six hundred eighty-one".