861386399 has 2 divisors, whose sum is σ = 861386400. Its totient is φ = 861386398.

The previous prime is 861386387. The next prime is 861386441. The reversal of 861386399 is 993683168.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861386399 - 2⁸ = 861386143 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 861386399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861386359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430693199 + 430693200.

It is an arithmetic number, because the mean of its divisors is an integer number (430693200).

Almost surely, 2^861386399 is an apocalyptic number.

861386399 is a deficient number, since it is larger than the sum of its proper divisors (1).

861386399 is an equidigital number, since it uses as much as digits as its factorization.

861386399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 53.

The square root of 861386399 is about 29349.3849850384. The cubic root of 861386399 is about 951.4792831648.

The spelling of 861386399 in words is "eight hundred sixty-one million, three hundred eighty-six thousand, three hundred ninety-nine".