83856989 has 4 divisors (see below), whose sum is σ = 83916156. Its totient is φ = 83797824.

The previous prime is 83856979. The next prime is 83857003. The reversal of 83856989 is 98965838.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98965838 = 2 ⋅49482919.

It can be written as a sum of positive squares in 2 ways, for example, as 59552089 + 24304900 = 7717^2 + 4930^2 .

It is a cyclic number.

It is not a de Polignac number, because 83856989 - 2²⁰ = 82808413 is a prime.

It is a super-2 number, since 2×83856989² = 14063989208292242, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83856979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27404 + ... + 30309.

It is an arithmetic number, because the mean of its divisors is an integer number (20979039).

Almost surely, 2^83856989 is an apocalyptic number.

It is an amenable number.

83856989 is a deficient number, since it is larger than the sum of its proper divisors (59167).

83856989 is a wasteful number, since it uses less digits than its factorization.

83856989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59166.

The product of its digits is 3732480, while the sum is 56.

The square root of 83856989 is about 9157.3461767043. The cubic root of 83856989 is about 437.7032333590.

The spelling of 83856989 in words is "eighty-three million, eight hundred fifty-six thousand, nine hundred eighty-nine".