84398191 has 4 divisors (see below), whose sum is σ = 85042584. Its totient is φ = 83753800.

The previous prime is 84398177. The next prime is 84398239. The reversal of 84398191 is 19189348.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84398191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84398161) 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, 322000 + ... + 322261.

It is an arithmetic number, because the mean of its divisors is an integer number (21260646).

Almost surely, 2^84398191 is an apocalyptic number.

84398191 is a deficient number, since it is larger than the sum of its proper divisors (644393).

84398191 is a wasteful number, since it uses less digits than its factorization.

84398191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644392.

The product of its digits is 62208, while the sum is 43.

The square root of 84398191 is about 9186.8488068543. The cubic root of 84398191 is about 438.6428412852.

The spelling of 84398191 in words is "eighty-four million, three hundred ninety-eight thousand, one hundred ninety-one".