972839781 has 16 divisors (see below), whose sum is σ = 1448568000. Its totient is φ = 645264144.

The previous prime is 972839753. The next prime is 972839821. The reversal of 972839781 is 187938279.

It is not a de Polignac number, because 972839781 - 2¹⁵ = 972807013 is a prime.

It is a super-2 number, since 2×972839781² = 1892834478992255922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (972839711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86131 + ... + 96768.

It is an arithmetic number, because the mean of its divisors is an integer number (90535500).

Almost surely, 2^972839781 is an apocalyptic number.

It is an amenable number.

972839781 is a deficient number, since it is larger than the sum of its proper divisors (475728219).

972839781 is a wasteful number, since it uses less digits than its factorization.

972839781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183105 (or 183099 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 54.

The square root of 972839781 is about 31190.3796225695. The cubic root of 972839781 is about 990.8633698929.

The spelling of 972839781 in words is "nine hundred seventy-two million, eight hundred thirty-nine thousand, seven hundred eighty-one".