978928999 has 2 divisors, whose sum is σ = 978929000. Its totient is φ = 978928998.

The previous prime is 978928991. The next prime is 978929009. The reversal of 978928999 is 999829879.

It is a weak prime.

It is an emirp because it is prime and its reverse (999829879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 978928999 - 2³ = 978928991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978928991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489464499 + 489464500.

It is an arithmetic number, because the mean of its divisors is an integer number (489464500).

Almost surely, 2^978928999 is an apocalyptic number.

978928999 is a deficient number, since it is larger than the sum of its proper divisors (1).

978928999 is an equidigital number, since it uses as much as digits as its factorization.

978928999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52907904, while the sum is 70.

The square root of 978928999 is about 31287.8410728513. The cubic root of 978928999 is about 992.9264153776.

The spelling of 978928999 in words is "nine hundred seventy-eight million, nine hundred twenty-eight thousand, nine hundred ninety-nine".