381839999 has 2 divisors, whose sum is σ = 381840000. Its totient is φ = 381839998.

The previous prime is 381839981. The next prime is 381840031. The reversal of 381839999 is 999938183.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 381839999 - 2⁸ = 381839743 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381839299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190919999 + 190920000.

It is an arithmetic number, because the mean of its divisors is an integer number (190920000).

Almost surely, 2^381839999 is an apocalyptic number.

381839999 is a deficient number, since it is larger than the sum of its proper divisors (1).

381839999 is an equidigital number, since it uses as much as digits as its factorization.

381839999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3779136, while the sum is 59.

The square root of 381839999 is about 19540.7266753312. The cubic root of 381839999 is about 725.4828327136.

The spelling of 381839999 in words is "three hundred eighty-one million, eight hundred thirty-nine thousand, nine hundred ninety-nine".