42440537 has 2 divisors, whose sum is σ = 42440538. Its totient is φ = 42440536.

The previous prime is 42440423. The next prime is 42440539. The reversal of 42440537 is 73504424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22762441 + 19678096 = 4771^2 + 4436^2 .

It is a cyclic number.

It is not a de Polignac number, because 42440537 - 2¹⁴ = 42424153 is a prime.

Together with 42440539, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_2572760 and since 42440537 and 2572760 have the same sum of digits, it is a Honaker prime.

It is a nialpdrome in base 9.

It is not a weakly prime, because it can be changed into another prime (42440539) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21220268 + 21220269.

It is an arithmetic number, because the mean of its divisors is an integer number (21220269).

Almost surely, 2^42440537 is an apocalyptic number.

It is an amenable number.

42440537 is a deficient number, since it is larger than the sum of its proper divisors (1).

42440537 is an equidigital number, since it uses as much as digits as its factorization.

42440537 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 42440537 is about 6514.6402049538. The cubic root of 42440537 is about 348.8137719054.

The spelling of 42440537 in words is "forty-two million, four hundred forty thousand, five hundred thirty-seven".