42794309 has 2 divisors, whose sum is σ = 42794310. Its totient is φ = 42794308.

The previous prime is 42794273. The next prime is 42794317. The reversal of 42794309 is 90349724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26553409 + 16240900 = 5153^2 + 4030^2 .

It is a cyclic number.

It is not a de Polignac number, because 42794309 - 2¹² = 42790213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42794399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21397154 + 21397155.

It is an arithmetic number, because the mean of its divisors is an integer number (21397155).

Almost surely, 2^42794309 is an apocalyptic number.

It is an amenable number.

42794309 is a deficient number, since it is larger than the sum of its proper divisors (1).

42794309 is an equidigital number, since it uses as much as digits as its factorization.

42794309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 42794309 is about 6541.7359316927. The cubic root of 42794309 is about 349.7802947665.

The spelling of 42794309 in words is "forty-two million, seven hundred ninety-four thousand, three hundred nine".