42704309 has 2 divisors, whose sum is σ = 42704310. Its totient is φ = 42704308.

The previous prime is 42704257. The next prime is 42704317. The reversal of 42704309 is 90340724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38068900 + 4635409 = 6170^2 + 2153^2 .

It is a cyclic number.

It is not a de Polignac number, because 42704309 - 2¹⁶ = 42638773 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 (42704339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21352154 + 21352155.

It is an arithmetic number, because the mean of its divisors is an integer number (21352155).

Almost surely, 2^42704309 is an apocalyptic number.

It is an amenable number.

42704309 is a deficient number, since it is larger than the sum of its proper divisors (1).

42704309 is an equidigital number, since it uses as much as digits as its factorization.

42704309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 42704309 is about 6534.8534030994. The cubic root of 42704309 is about 349.5349169612.

The spelling of 42704309 in words is "forty-two million, seven hundred four thousand, three hundred nine".