999774389 has 2 divisors, whose sum is σ = 999774390. Its totient is φ = 999774388.

The previous prime is 999774343. The next prime is 999774407. The reversal of 999774389 is 983477999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 684711889 + 315062500 = 26167^2 + 17750^2 .

It is a cyclic number.

It is not a de Polignac number, because 999774389 - 2⁸ = 999774133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999774329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499887194 + 499887195.

It is an arithmetic number, because the mean of its divisors is an integer number (499887195).

Almost surely, 2^999774389 is an apocalyptic number.

It is an amenable number.

999774389 is a deficient number, since it is larger than the sum of its proper divisors (1).

999774389 is an equidigital number, since it uses as much as digits as its factorization.

999774389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30862944, while the sum is 65.

The square root of 999774389 is about 31619.2091773340. The cubic root of 999774389 is about 999.9247906770.

The spelling of 999774389 in words is "nine hundred ninety-nine million, seven hundred seventy-four thousand, three hundred eighty-nine".