978516449 has 4 divisors (see below), whose sum is σ = 982324164. Its totient is φ = 974708736.

The previous prime is 978516437. The next prime is 978516479. The reversal of 978516449 is 944615879.

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

It can be written as a sum of positive squares in 2 ways, for example, as 558471424 + 420045025 = 23632^2 + 20495^2 .

It is a cyclic number.

It is not a de Polignac number, because 978516449 - 2⁸ = 978516193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 978516449.

It is not an unprimeable number, because it can be changed into a prime (978516479) 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 in 3 ways as a sum of consecutive naturals, for example, 1903472 + ... + 1903985.

It is an arithmetic number, because the mean of its divisors is an integer number (245581041).

Almost surely, 2^978516449 is an apocalyptic number.

It is an amenable number.

978516449 is a deficient number, since it is larger than the sum of its proper divisors (3807715).

978516449 is a wasteful number, since it uses less digits than its factorization.

978516449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3807714.

The product of its digits is 2177280, while the sum is 53.

The square root of 978516449 is about 31281.2475614385. The cubic root of 978516449 is about 992.7869128021.

The spelling of 978516449 in words is "nine hundred seventy-eight million, five hundred sixteen thousand, four hundred forty-nine".