978727879 has 2 divisors, whose sum is σ = 978727880. Its totient is φ = 978727878.

The previous prime is 978727847. The next prime is 978727889.

It is a happy number.

978727879 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 978727879 - 2⁵ = 978727847 is a prime.

It is a super-2 number, since 2×978727879² = 1915816522263677282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 978727879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978727819) by changing a digit.

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 as a sum of consecutive naturals, namely, 489363939 + 489363940.

It is an arithmetic number, because the mean of its divisors is an integer number (489363940).

Almost surely, 2^978727879 is an apocalyptic number.

978727879 is a deficient number, since it is larger than the sum of its proper divisors (1).

978727879 is an equidigital number, since it uses as much as digits as its factorization.

978727879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24893568, while the sum is 64.

The square root of 978727879 is about 31284.6268796673. The cubic root of 978727879 is about 992.8584121352.

The spelling of 978727879 in words is "nine hundred seventy-eight million, seven hundred twenty-seven thousand, eight hundred seventy-nine".