381967819 has 2 divisors, whose sum is σ = 381967820. Its totient is φ = 381967818.

The previous prime is 381967801. The next prime is 381967823. The reversal of 381967819 is 918769183.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 381967819 - 2⁹ = 381967307 is a prime.

It is a super-2 number, since 2×381967819² = 291798829503233522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (381967519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190983909 + 190983910.

It is an arithmetic number, because the mean of its divisors is an integer number (190983910).

Almost surely, 2^381967819 is an apocalyptic number.

381967819 is a deficient number, since it is larger than the sum of its proper divisors (1).

381967819 is an equidigital number, since it uses as much as digits as its factorization.

381967819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 52.

The square root of 381967819 is about 19543.9970067538. The cubic root of 381967819 is about 725.5637748802.

The spelling of 381967819 in words is "three hundred eighty-one million, nine hundred sixty-seven thousand, eight hundred nineteen".