42040637 has 2 divisors, whose sum is σ = 42040638. Its totient is φ = 42040636.

The previous prime is 42040631. The next prime is 42040667. The reversal of 42040637 is 73604024.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34234201 + 7806436 = 5851^2 + 2794^2 .

It is a cyclic number.

It is not a de Polignac number, because 42040637 - 2¹⁴ = 42024253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42040631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21020318 + 21020319.

It is an arithmetic number, because the mean of its divisors is an integer number (21020319).

Almost surely, 2^42040637 is an apocalyptic number.

It is an amenable number.

42040637 is a deficient number, since it is larger than the sum of its proper divisors (1).

42040637 is an equidigital number, since it uses as much as digits as its factorization.

42040637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 42040637 is about 6483.8751530238. The cubic root of 42040637 is about 347.7147357285.

The spelling of 42040637 in words is "forty-two million, forty thousand, six hundred thirty-seven".