42902309 has 2 divisors, whose sum is σ = 42902310. Its totient is φ = 42902308.

The previous prime is 42902297. The next prime is 42902341. The reversal of 42902309 is 90320924.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31192225 + 11710084 = 5585^2 + 3422^2 .

It is a cyclic number.

It is not a de Polignac number, because 42902309 - 2²⁰ = 41853733 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42952309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21451154 + 21451155.

It is an arithmetic number, because the mean of its divisors is an integer number (21451155).

Almost surely, 2^42902309 is an apocalyptic number.

It is an amenable number.

42902309 is a deficient number, since it is larger than the sum of its proper divisors (1).

42902309 is an equidigital number, since it uses as much as digits as its factorization.

42902309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 42902309 is about 6549.9854198311. The cubic root of 42902309 is about 350.0742944325.

The spelling of 42902309 in words is "forty-two million, nine hundred two thousand, three hundred nine".