978791 has 8 divisors (see below), whose sum is σ = 1079568. Its totient is φ = 880000.

The previous prime is 978773. The next prime is 978797. The reversal of 978791 is 197879.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 978791 - 2⁶ = 978727 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 671 + ... + 1551.

It is an arithmetic number, because the mean of its divisors is an integer number (134946).

2⁹⁷⁸⁷⁹¹ is an apocalyptic number.

978791 is a deficient number, since it is larger than the sum of its proper divisors (100777).

978791 is a wasteful number, since it uses less digits than its factorization.

978791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993.

The product of its digits is 31752, while the sum is 41.

The square root of 978791 is about 989.3386680000. The cubic root of 978791 is about 99.2879755783.

It can be divided in two parts, 97 and 8791, that added together give a palindrome (8888).

The spelling of 978791 in words is "nine hundred seventy-eight thousand, seven hundred ninety-one".