379731821 has 18 divisors (see below), whose sum is σ = 447718698. Its totient is φ = 321098400.

The previous prime is 379731799. The next prime is 379731827. The reversal of 379731821 is 128137973.

It can be written as a sum of positive squares in 3 ways, for example, as 39513796 + 340218025 = 6286^2 + 18445^2 .

It is not a de Polignac number, because 379731821 - 2⁶ = 379731757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (379731827) 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 in 17 ways as a sum of consecutive naturals, for example, 1370735 + ... + 1371011.

It is an arithmetic number, because the mean of its divisors is an integer number (24873261).

Almost surely, 2^379731821 is an apocalyptic number.

It is an amenable number.

379731821 is a deficient number, since it is larger than the sum of its proper divisors (67986877).

379731821 is an equidigital number, since it uses as much as digits as its factorization.

379731821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669 (or 385 counting only the distinct ones).

The product of its digits is 63504, while the sum is 41.

The square root of 379731821 is about 19486.7088293534. The cubic root of 379731821 is about 724.1452128016.

The spelling of 379731821 in words is "three hundred seventy-nine million, seven hundred thirty-one thousand, eight hundred twenty-one".