742018309 has 2 divisors, whose sum is σ = 742018310. Its totient is φ = 742018308.

The previous prime is 742018301. The next prime is 742018337. The reversal of 742018309 is 903810247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 445421025 + 296597284 = 21105^2 + 17222^2 .

It is an emirp because it is prime and its reverse (903810247) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 742018309 - 2³ = 742018301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (742018301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371009154 + 371009155.

It is an arithmetic number, because the mean of its divisors is an integer number (371009155).

Almost surely, 2^742018309 is an apocalyptic number.

It is an amenable number.

742018309 is a deficient number, since it is larger than the sum of its proper divisors (1).

742018309 is an equidigital number, since it uses as much as digits as its factorization.

742018309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 742018309 is about 27240.0130139470. The cubic root of 742018309 is about 905.3257514996.

The spelling of 742018309 in words is "seven hundred forty-two million, eighteen thousand, three hundred nine".