978977999 has 8 divisors (see below), whose sum is σ = 997913520. Its totient is φ = 960059776.

The previous prime is 978977981. The next prime is 978978001. The reversal of 978977999 is 999779879.

978977999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 978977999 - 2⁸ = 978977743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978977939) 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, 223559 + ... + 227895.

It is an arithmetic number, because the mean of its divisors is an integer number (124739190).

Almost surely, 2^978977999 is an apocalyptic number.

978977999 is a deficient number, since it is larger than the sum of its proper divisors (18935521).

978977999 is a wasteful number, since it uses less digits than its factorization.

978977999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8649.

The product of its digits is 162030456, while the sum is 74.

The square root of 978977999 is about 31288.6241148440. The cubic root of 978977999 is about 992.9429819800.

The spelling of 978977999 in words is "nine hundred seventy-eight million, nine hundred seventy-seven thousand, nine hundred ninety-nine".