381305879 has 2 divisors, whose sum is σ = 381305880. Its totient is φ = 381305878.

The previous prime is 381305861. The next prime is 381305893. The reversal of 381305879 is 978503183.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 381305879 - 2²⁰ = 380257303 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 (381305809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190652939 + 190652940.

It is an arithmetic number, because the mean of its divisors is an integer number (190652940).

Almost surely, 2^381305879 is an apocalyptic number.

381305879 is a deficient number, since it is larger than the sum of its proper divisors (1).

381305879 is an equidigital number, since it uses as much as digits as its factorization.

381305879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 381305879 is about 19527.0550519017. The cubic root of 381305879 is about 725.1444050049.

The spelling of 381305879 in words is "three hundred eighty-one million, three hundred five thousand, eight hundred seventy-nine".