861397927 has 32 divisors (see below), whose sum is σ = 997169600. Its totient is φ = 737538048.

The previous prime is 861397921. The next prime is 861397937. The reversal of 861397927 is 729793168.

It is not a de Polignac number, because 861397927 - 2¹¹ = 861395879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861397921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3761449 + ... + 3761677.

It is an arithmetic number, because the mean of its divisors is an integer number (31161550).

Almost surely, 2^861397927 is an apocalyptic number.

861397927 is a deficient number, since it is larger than the sum of its proper divisors (135771673).

861397927 is a wasteful number, since it uses less digits than its factorization.

861397927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515.

The product of its digits is 1143072, while the sum is 52.

The square root of 861397927 is about 29349.5813769123. The cubic root of 861397927 is about 951.4835277192.

The spelling of 861397927 in words is "eight hundred sixty-one million, three hundred ninety-seven thousand, nine hundred twenty-seven".