861907 has 2 divisors, whose sum is σ = 861908. Its totient is φ = 861906.

The previous prime is 861901. The next prime is 861929. The reversal of 861907 is 709168.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861907 - 2³ = 861899 is a prime.

It is not a weakly prime, because it can be changed into another prime (861901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430953 + 430954.

It is an arithmetic number, because the mean of its divisors is an integer number (430954).

2⁸⁶¹⁹⁰⁷ is an apocalyptic number.

861907 is a deficient number, since it is larger than the sum of its proper divisors (1).

861907 is an equidigital number, since it uses as much as digits as its factorization.

861907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 861907 is about 928.3894656878. The cubic root of 861907 is about 95.1670928211.

The spelling of 861907 in words is "eight hundred sixty-one thousand, nine hundred seven".