42309769 has 2 divisors, whose sum is σ = 42309770. Its totient is φ = 42309768.

The previous prime is 42309749. The next prime is 42309779. The reversal of 42309769 is 96790324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29975625 + 12334144 = 5475^2 + 3512^2 .

It is a cyclic number.

It is not a de Polignac number, because 42309769 - 2⁵ = 42309737 is a prime.

It is a super-2 number, since 2×42309769² = 3580233105666722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42309739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21154884 + 21154885.

It is an arithmetic number, because the mean of its divisors is an integer number (21154885).

Almost surely, 2^42309769 is an apocalyptic number.

It is an amenable number.

42309769 is a deficient number, since it is larger than the sum of its proper divisors (1).

42309769 is an equidigital number, since it uses as much as digits as its factorization.

42309769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 42309769 is about 6504.5959905285. The cubic root of 42309769 is about 348.4551477277.

The spelling of 42309769 in words is "forty-two million, three hundred nine thousand, seven hundred sixty-nine".