84172079 has 4 divisors (see below), whose sum is σ = 84313200. Its totient is φ = 84030960.

The previous prime is 84172073. The next prime is 84172141. The reversal of 84172079 is 97027148.

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-84172079 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 (84172073) 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, 69662 + ... + 70859.

It is an arithmetic number, because the mean of its divisors is an integer number (21078300).

Almost surely, 2^84172079 is an apocalyptic number.

84172079 is a deficient number, since it is larger than the sum of its proper divisors (141121).

84172079 is a wasteful number, since it uses less digits than its factorization.

84172079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141120.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 84172079 is about 9174.5342661086. The cubic root of 84172079 is about 438.2507668638.

The spelling of 84172079 in words is "eighty-four million, one hundred seventy-two thousand, seventy-nine".