85387139 has 4 divisors (see below), whose sum is σ = 85496424. Its totient is φ = 85277856.

The previous prime is 85387097. The next prime is 85387147. The reversal of 85387139 is 93178358.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85387139 - 2⁸ = 85386883 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85387139.

It is not an unprimeable number, because it can be changed into a prime (85387199) 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, 53462 + ... + 55035.

It is an arithmetic number, because the mean of its divisors is an integer number (21374106).

Almost surely, 2^85387139 is an apocalyptic number.

85387139 is a deficient number, since it is larger than the sum of its proper divisors (109285).

85387139 is a wasteful number, since it uses less digits than its factorization.

85387139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109284.

The product of its digits is 181440, while the sum is 44.

The square root of 85387139 is about 9240.5161652367. The cubic root of 85387139 is about 440.3494795762.

The spelling of 85387139 in words is "eighty-five million, three hundred eighty-seven thousand, one hundred thirty-nine".