861857273 has 8 divisors (see below), whose sum is σ = 873995400. Its totient is φ = 849804160.

The previous prime is 861857261. The next prime is 861857281. The reversal of 861857273 is 372758168.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 230189584 + 631667689 = 15172^2 + 25133^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 861857273 - 2¹² = 861853177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (861857573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 698 + ... + 41523.

It is an arithmetic number, because the mean of its divisors is an integer number (109249425).

Almost surely, 2^861857273 is an apocalyptic number.

It is an amenable number.

861857273 is a deficient number, since it is larger than the sum of its proper divisors (12138127).

861857273 is a wasteful number, since it uses less digits than its factorization.

861857273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42507.

The product of its digits is 564480, while the sum is 47.

The square root of 861857273 is about 29357.4057607276. The cubic root of 861857273 is about 951.6526259077.

The spelling of 861857273 in words is "eight hundred sixty-one million, eight hundred fifty-seven thousand, two hundred seventy-three".