42637769 has 2 divisors, whose sum is σ = 42637770. Its totient is φ = 42637768.

The previous prime is 42637747. The next prime is 42637781. The reversal of 42637769 is 96773624.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35940025 + 6697744 = 5995^2 + 2588^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42637769 is a prime.

It is a super-2 number, since 2×42637769² = 3635958690594722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42637669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21318884 + 21318885.

It is an arithmetic number, because the mean of its divisors is an integer number (21318885).

Almost surely, 2^42637769 is an apocalyptic number.

It is an amenable number.

42637769 is a deficient number, since it is larger than the sum of its proper divisors (1).

42637769 is an equidigital number, since it uses as much as digits as its factorization.

42637769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 44.

The square root of 42637769 is about 6529.7602559359. The cubic root of 42637769 is about 349.3532792118.

The spelling of 42637769 in words is "forty-two million, six hundred thirty-seven thousand, seven hundred sixty-nine".