381223979 has 2 divisors, whose sum is σ = 381223980. Its totient is φ = 381223978.

The previous prime is 381223949. The next prime is 381224021. The reversal of 381223979 is 979322183.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 381223979 - 2⁸ = 381223723 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (381223949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190611989 + 190611990.

It is an arithmetic number, because the mean of its divisors is an integer number (190611990).

Almost surely, 2^381223979 is an apocalyptic number.

381223979 is a deficient number, since it is larger than the sum of its proper divisors (1).

381223979 is an equidigital number, since it uses as much as digits as its factorization.

381223979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 44.

The square root of 381223979 is about 19524.9578488662. The cubic root of 381223979 is about 725.0924838024.

The spelling of 381223979 in words is "three hundred eighty-one million, two hundred twenty-three thousand, nine hundred seventy-nine".