861957 has 6 divisors (see below), whose sum is σ = 1245062. Its totient is φ = 574632.

The previous prime is 861947. The next prime is 861977. The reversal of 861957 is 759168.

It can be written as a sum of positive squares in only one way, i.e., 690561 + 171396 = 831^2 + 414^2 .

It is not a de Polignac number, because 861957 - 2⁴ = 861941 is a prime.

It is a Duffinian number.

861957 is a lucky number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861907) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47878 + ... + 47895.

2⁸⁶¹⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

861957 is a deficient number, since it is larger than the sum of its proper divisors (383105).

861957 is a wasteful number, since it uses less digits than its factorization.

861957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95779 (or 95776 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 861957 is about 928.4163936510. The cubic root of 861957 is about 95.1689330284.

The spelling of 861957 in words is "eight hundred sixty-one thousand, nine hundred fifty-seven".