42799409 has 2 divisors, whose sum is σ = 42799410. Its totient is φ = 42799408.

The previous prime is 42799397. The next prime is 42799423. The reversal of 42799409 is 90499724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22800625 + 19998784 = 4775^2 + 4472^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42799409 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42799409.

It is not a weakly prime, because it can be changed into another prime (42799429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21399704 + 21399705.

It is an arithmetic number, because the mean of its divisors is an integer number (21399705).

Almost surely, 2^42799409 is an apocalyptic number.

It is an amenable number.

42799409 is a deficient number, since it is larger than the sum of its proper divisors (1).

42799409 is an equidigital number, since it uses as much as digits as its factorization.

42799409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 42799409 is about 6542.1257248696. The cubic root of 42799409 is about 349.7941892047.

The spelling of 42799409 in words is "forty-two million, seven hundred ninety-nine thousand, four hundred nine".