999978367 has 2 divisors, whose sum is σ = 999978368. Its totient is φ = 999978366.

The previous prime is 999978359. The next prime is 999978407. The reversal of 999978367 is 763879999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999978367 - 2³ = 999978359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999978467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499989183 + 499989184.

It is an arithmetic number, because the mean of its divisors is an integer number (499989184).

Almost surely, 2^999978367 is an apocalyptic number.

999978367 is a deficient number, since it is larger than the sum of its proper divisors (1).

999978367 is an equidigital number, since it uses as much as digits as its factorization.

999978367 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46294416, while the sum is 67.

The square root of 999978367 is about 31622.4345520708. The cubic root of 999978367 is about 999.9927889480.

The spelling of 999978367 in words is "nine hundred ninety-nine million, nine hundred seventy-eight thousand, three hundred sixty-seven".