83855139 has 4 divisors (see below), whose sum is σ = 111806856. Its totient is φ = 55903424.

The previous prime is 83855137. The next prime is 83855141. The reversal of 83855139 is 93155838.

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

It is an interprime number because it is at equal distance from previous prime (83855137) and next prime (83855141).

It is a cyclic number.

It is not a de Polignac number, because 83855139 - 2¹ = 83855137 is a prime.

It is a super-4 number, since 4×83855139⁴ (a number of 33 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 83855139.

It is not an unprimeable number, because it can be changed into a prime (83855131) 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, 13975854 + ... + 13975859.

It is an arithmetic number, because the mean of its divisors is an integer number (27951714).

Almost surely, 2^83855139 is an apocalyptic number.

83855139 is a deficient number, since it is larger than the sum of its proper divisors (27951717).

83855139 is a wasteful number, since it uses less digits than its factorization.

83855139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27951716.

The product of its digits is 129600, while the sum is 42.

The square root of 83855139 is about 9157.2451643494. The cubic root of 83855139 is about 437.7000145578.

The spelling of 83855139 in words is "eighty-three million, eight hundred fifty-five thousand, one hundred thirty-nine".