84512399 has 4 divisors (see below), whose sum is σ = 88960440. Its totient is φ = 80064360.

The previous prime is 84512377. The next prime is 84512411. The reversal of 84512399 is 99321548.

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-84512399 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 (84512359) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 2223992 + ... + 2224029.

It is an arithmetic number, because the mean of its divisors is an integer number (22240110).

Almost surely, 2^84512399 is an apocalyptic number.

84512399 is a deficient number, since it is larger than the sum of its proper divisors (4448041).

84512399 is a wasteful number, since it uses less digits than its factorization.

84512399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4448040.

The product of its digits is 77760, while the sum is 41.

The square root of 84512399 is about 9193.0625473778. The cubic root of 84512399 is about 438.8406099065.

The spelling of 84512399 in words is "eighty-four million, five hundred twelve thousand, three hundred ninety-nine".