85820138 has 4 divisors (see below), whose sum is σ = 128730210. Its totient is φ = 42910068.

The previous prime is 85820101. The next prime is 85820171. The reversal of 85820138 is 83102858.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83102858 = 2 ⋅41551429.

It can be written as a sum of positive squares in only one way, i.e., 44049769 + 41770369 = 6637^2 + 6463^2 .

It is a junction number, because it is equal to n+sod(n) for n = 85820098 and 85820107.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21455033 + ... + 21455036.

Almost surely, 2^85820138 is an apocalyptic number.

85820138 is a deficient number, since it is larger than the sum of its proper divisors (42910072).

85820138 is a wasteful number, since it uses less digits than its factorization.

85820138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42910071.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 85820138 is about 9263.9159106719. The cubic root of 85820138 is about 441.0925637358.

It can be divided in two parts, 85820 and 138, that added together give a palindrome (85958).

The spelling of 85820138 in words is "eighty-five million, eight hundred twenty thousand, one hundred thirty-eight".