42540437 has 2 divisors, whose sum is σ = 42540438. Its totient is φ = 42540436.

The previous prime is 42540413. The next prime is 42540457. The reversal of 42540437 is 73404524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42432196 + 108241 = 6514^2 + 329^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42540437 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 (42540457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21270218 + 21270219.

It is an arithmetic number, because the mean of its divisors is an integer number (21270219).

Almost surely, 2^42540437 is an apocalyptic number.

It is an amenable number.

42540437 is a deficient number, since it is larger than the sum of its proper divisors (1).

42540437 is an equidigital number, since it uses as much as digits as its factorization.

42540437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 29.

The square root of 42540437 is about 6522.3030441708. The cubic root of 42540437 is about 349.0872462177.

The spelling of 42540437 in words is "forty-two million, five hundred forty thousand, four hundred thirty-seven".