978992407 has 2 divisors, whose sum is σ = 978992408. Its totient is φ = 978992406.

The previous prime is 978992363. The next prime is 978992437. The reversal of 978992407 is 704299879.

It is a strong prime.

It is an emirp because it is prime and its reverse (704299879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 978992407 - 2⁷ = 978992279 is a prime.

It is a super-2 number, since 2×978992407² = 1916852265927307298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978992437) 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, 489496203 + 489496204.

It is an arithmetic number, because the mean of its divisors is an integer number (489496204).

Almost surely, 2^978992407 is an apocalyptic number.

978992407 is a deficient number, since it is larger than the sum of its proper divisors (1).

978992407 is an equidigital number, since it uses as much as digits as its factorization.

978992407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2286144, while the sum is 55.

The square root of 978992407 is about 31288.8543574225. The cubic root of 978992407 is about 992.9478531322.

The spelling of 978992407 in words is "nine hundred seventy-eight million, nine hundred ninety-two thousand, four hundred seven".