85844639 has 4 divisors (see below), whose sum is σ = 86931360. Its totient is φ = 84757920.

The previous prime is 85844623. The next prime is 85844651. The reversal of 85844639 is 93644858.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93644858 = 2 ⋅46822429.

It is a cyclic number.

It is not a de Polignac number, because 85844639 - 2⁴ = 85844623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85844593 and 85844602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85840639) 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, 543242 + ... + 543399.

It is an arithmetic number, because the mean of its divisors is an integer number (21732840).

Almost surely, 2^85844639 is an apocalyptic number.

85844639 is a deficient number, since it is larger than the sum of its proper divisors (1086721).

85844639 is a wasteful number, since it uses less digits than its factorization.

85844639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086720.

The product of its digits is 829440, while the sum is 47.

The square root of 85844639 is about 9265.2382052487. The cubic root of 85844639 is about 441.1345359382.

The spelling of 85844639 in words is "eighty-five million, eight hundred forty-four thousand, six hundred thirty-nine".