972221985 has 72 divisors (see below), whose sum is σ = 1968759936. Its totient is φ = 442532160.

The previous prime is 972221951. The next prime is 972222023. The reversal of 972221985 is 589122279.

It is a happy number.

It is not a de Polignac number, because 972221985 - 2¹⁰ = 972220961 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 972221985.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 596742 + ... + 598368.

It is an arithmetic number, because the mean of its divisors is an integer number (27343888).

Almost surely, 2^972221985 is an apocalyptic number.

It is an amenable number.

972221985 is an abundant number, since it is smaller than the sum of its proper divisors (996537951).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

972221985 is a wasteful number, since it uses less digits than its factorization.

972221985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923 (or 1913 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 972221985 is about 31180.4744190976. The cubic root of 972221985 is about 990.6535782207.

The spelling of 972221985 in words is "nine hundred seventy-two million, two hundred twenty-one thousand, nine hundred eighty-five".