999977399 has 2 divisors, whose sum is σ = 999977400. Its totient is φ = 999977398.

The previous prime is 999977369. The next prime is 999977411. The reversal of 999977399 is 993779999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999977399 - 2¹⁶ = 999911863 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999977359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499988699 + 499988700.

It is an arithmetic number, because the mean of its divisors is an integer number (499988700).

Almost surely, 2^999977399 is an apocalyptic number.

999977399 is a deficient number, since it is larger than the sum of its proper divisors (1).

999977399 is an equidigital number, since it uses as much as digits as its factorization.

999977399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78121827, while the sum is 71.

The square root of 999977399 is about 31622.4192464776. The cubic root of 999977399 is about 999.9924662766.

The spelling of 999977399 in words is "nine hundred ninety-nine million, nine hundred seventy-seven thousand, three hundred ninety-nine".