379943821 has 2 divisors, whose sum is σ = 379943822. Its totient is φ = 379943820.

The previous prime is 379943813. The next prime is 379943849. The reversal of 379943821 is 128349973.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 364428100 + 15515721 = 19090^2 + 3939^2 .

It is an emirp because it is prime and its reverse (128349973) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 379943821 - 2³ = 379943813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (379943021) 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, 189971910 + 189971911.

It is an arithmetic number, because the mean of its divisors is an integer number (189971911).

Almost surely, 2^379943821 is an apocalyptic number.

It is an amenable number.

379943821 is a deficient number, since it is larger than the sum of its proper divisors (1).

379943821 is an equidigital number, since it uses as much as digits as its factorization.

379943821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 46.

The square root of 379943821 is about 19492.1476754102. The cubic root of 379943821 is about 724.2799484371.

The spelling of 379943821 in words is "three hundred seventy-nine million, nine hundred forty-three thousand, eight hundred twenty-one".