381383939 has 2 divisors, whose sum is σ = 381383940. Its totient is φ = 381383938.

The previous prime is 381383909. The next prime is 381383963. The reversal of 381383939 is 939383183.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 381383939 - 2⁸ = 381383683 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 381383893 and 381383902.

It is not a weakly prime, because it can be changed into another prime (381383909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190691969 + 190691970.

It is an arithmetic number, because the mean of its divisors is an integer number (190691970).

Almost surely, 2^381383939 is an apocalyptic number.

381383939 is a deficient number, since it is larger than the sum of its proper divisors (1).

381383939 is an equidigital number, since it uses as much as digits as its factorization.

381383939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 47.

The square root of 381383939 is about 19529.0537149141. The cubic root of 381383939 is about 725.1938848872.

The spelling of 381383939 in words is "three hundred eighty-one million, three hundred eighty-three thousand, nine hundred thirty-nine".