742686389 has 2 divisors, whose sum is σ = 742686390. Its totient is φ = 742686388.

The previous prime is 742686377. The next prime is 742686397. The reversal of 742686389 is 983686247.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 709796164 + 32890225 = 26642^2 + 5735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-742686389 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 742686389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (742686589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371343194 + 371343195.

It is an arithmetic number, because the mean of its divisors is an integer number (371343195).

Almost surely, 2^742686389 is an apocalyptic number.

It is an amenable number.

742686389 is a deficient number, since it is larger than the sum of its proper divisors (1).

742686389 is an equidigital number, since it uses as much as digits as its factorization.

742686389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 53.

The square root of 742686389 is about 27252.2730978537. The cubic root of 742686389 is about 905.5973748952.

The spelling of 742686389 in words is "seven hundred forty-two million, six hundred eighty-six thousand, three hundred eighty-nine".