42734309 has 2 divisors, whose sum is σ = 42734310. Its totient is φ = 42734308.

The previous prime is 42734291. The next prime is 42734317. The reversal of 42734309 is 90343724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40322500 + 2411809 = 6350^2 + 1553^2 .

It is a cyclic number.

It is not a de Polignac number, because 42734309 - 2⁸ = 42734053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42734509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21367154 + 21367155.

It is an arithmetic number, because the mean of its divisors is an integer number (21367155).

Almost surely, 2^42734309 is an apocalyptic number.

It is an amenable number.

42734309 is a deficient number, since it is larger than the sum of its proper divisors (1).

42734309 is an equidigital number, since it uses as much as digits as its factorization.

42734309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 42734309 is about 6537.1483844257. The cubic root of 42734309 is about 349.6167478366.

The spelling of 42734309 in words is "forty-two million, seven hundred thirty-four thousand, three hundred nine".