83861857 has 6 divisors (see below), whose sum is σ = 84225062. Its totient is φ = 83500032.

The previous prime is 83861849. The next prime is 83861891. The reversal of 83861857 is 75816838.

It can be written as a sum of positive squares in 3 ways, for example, as 3651921 + 80209936 = 1911^2 + 8956^2 .

It is not a de Polignac number, because 83861857 - 2³ = 83861849 is a prime.

It is a super-2 number, since 2×83861857² = 14065622118976898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83861807) 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, 124273 + ... + 124945.

Almost surely, 2^83861857 is an apocalyptic number.

It is an amenable number.

83861857 is a deficient number, since it is larger than the sum of its proper divisors (363205).

83861857 is an frugal number, since it uses more digits than its factorization.

83861857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1379 (or 1026 counting only the distinct ones).

The product of its digits is 322560, while the sum is 46.

The square root of 83861857 is about 9157.6119703774. The cubic root of 83861857 is about 437.7117029298.

The spelling of 83861857 in words is "eighty-three million, eight hundred sixty-one thousand, eight hundred fifty-seven".