499997789 has 2 divisors, whose sum is σ = 499997790. Its totient is φ = 499997788.

The previous prime is 499997783. The next prime is 499997809. The reversal of 499997789 is 987799994.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 464057764 + 35940025 = 21542^2 + 5995^2 .

It is a cyclic number.

It is not a de Polignac number, because 499997789 - 2²⁸ = 231562333 is a 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 (499997783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249998894 + 249998895.

It is an arithmetic number, because the mean of its divisors is an integer number (249998895).

Almost surely, 2^499997789 is an apocalyptic number.

It is an amenable number.

499997789 is a deficient number, since it is larger than the sum of its proper divisors (1).

499997789 is an equidigital number, since it uses as much as digits as its factorization.

499997789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92588832, while the sum is 71.

The square root of 499997789 is about 22360.6303354803. The cubic root of 499997789 is about 793.6993560678.

The spelling of 499997789 in words is "four hundred ninety-nine million, nine hundred ninety-seven thousand, seven hundred eighty-nine".