742909 has 2 divisors, whose sum is σ = 742910. Its totient is φ = 742908.

The previous prime is 742897. The next prime is 742913. The reversal of 742909 is 909247.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 558009 + 184900 = 747^2 + 430^2 .

It is an emirp because it is prime and its reverse (909247) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 742909 - 2¹³ = 734717 is a prime.

742909 is a lucky number.

It is equal to p₅₉₇₃₇ and since 742909 and 59737 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (742949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371454 + 371455.

It is an arithmetic number, because the mean of its divisors is an integer number (371455).

2⁷⁴²⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

742909 is a deficient number, since it is larger than the sum of its proper divisors (1).

742909 is an equidigital number, since it uses as much as digits as its factorization.

742909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 742909 is about 861.9216901784. The cubic root of 742909 is about 90.5687846370.

The spelling of 742909 in words is "seven hundred forty-two thousand, nine hundred nine".