379817861 has 2 divisors, whose sum is σ = 379817862. Its totient is φ = 379817860.

The previous prime is 379817849. The next prime is 379817881. The reversal of 379817861 is 168718973.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 378302500 + 1515361 = 19450^2 + 1231^2 .

It is a cyclic number.

It is not a de Polignac number, because 379817861 - 2¹⁰ = 379816837 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 (379817831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189908930 + 189908931.

It is an arithmetic number, because the mean of its divisors is an integer number (189908931).

Almost surely, 2^379817861 is an apocalyptic number.

It is an amenable number.

379817861 is a deficient number, since it is larger than the sum of its proper divisors (1).

379817861 is an equidigital number, since it uses as much as digits as its factorization.

379817861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 50.

The square root of 379817861 is about 19488.9163628971. The cubic root of 379817861 is about 724.1999011769.

The spelling of 379817861 in words is "three hundred seventy-nine million, eight hundred seventeen thousand, eight hundred sixty-one".