972839779 has 4 divisors (see below), whose sum is σ = 999132784. Its totient is φ = 946546776.

The previous prime is 972839753. The next prime is 972839821. The reversal of 972839779 is 977938279.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 972839779 - 2¹¹ = 972837731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (972831779) 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 3 ways as a sum of consecutive naturals, for example, 13146447 + ... + 13146520.

It is an arithmetic number, because the mean of its divisors is an integer number (249783196).

Almost surely, 2^972839779 is an apocalyptic number.

972839779 is a deficient number, since it is larger than the sum of its proper divisors (26293005).

972839779 is a wasteful number, since it uses less digits than its factorization.

972839779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26293004.

The product of its digits is 12002256, while the sum is 61.

The square root of 972839779 is about 31190.3795905084. The cubic root of 972839779 is about 990.8633692138.

The spelling of 972839779 in words is "nine hundred seventy-two million, eight hundred thirty-nine thousand, seven hundred seventy-nine".