85240138 has 4 divisors (see below), whose sum is σ = 127860210. Its totient is φ = 42620068.

The previous prime is 85240123. The next prime is 85240151. The reversal of 85240138 is 83104258.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83104258 = 2 ⋅41552129.

It can be written as a sum of positive squares in only one way, i.e., 84143929 + 1096209 = 9173^2 + 1047^2 .

It is a super-2 number, since 2×85240138² = 14531762252518088, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21310033 + ... + 21310036.

Almost surely, 2^85240138 is an apocalyptic number.

85240138 is a deficient number, since it is larger than the sum of its proper divisors (42620072).

85240138 is a wasteful number, since it uses less digits than its factorization.

85240138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42620071.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 85240138 is about 9232.5585836213. The cubic root of 85240138 is about 440.0966351110.

The spelling of 85240138 in words is "eighty-five million, two hundred forty thousand, one hundred thirty-eight".