84072172 has 6 divisors (see below), whose sum is σ = 147126308. Its totient is φ = 42036084.

The previous prime is 84072167. The next prime is 84072179. The reversal of 84072172 is 27127048.

It is not an unprimeable number, because it can be changed into a prime (84072179) 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 as a sum of consecutive naturals, namely, 10509018 + ... + 10509025.

Almost surely, 2^84072172 is an apocalyptic number.

It is an amenable number.

84072172 is a deficient number, since it is larger than the sum of its proper divisors (63054136).

84072172 is a wasteful number, since it uses less digits than its factorization.

84072172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21018047 (or 21018045 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 84072172 is about 9169.0878499445. The cubic root of 84072172 is about 438.0773061216.

The spelling of 84072172 in words is "eighty-four million, seventy-two thousand, one hundred seventy-two".