42637247 has 2 divisors, whose sum is σ = 42637248. Its totient is φ = 42637246.

The previous prime is 42637229. The next prime is 42637249. The reversal of 42637247 is 74273624.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42637247 is a prime.

Together with 42637249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42637249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21318623 + 21318624.

It is an arithmetic number, because the mean of its divisors is an integer number (21318624).

Almost surely, 2^42637247 is an apocalyptic number.

42637247 is a deficient number, since it is larger than the sum of its proper divisors (1).

42637247 is an equidigital number, since it uses as much as digits as its factorization.

42637247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 35.

The square root of 42637247 is about 6529.7202849739. The cubic root of 42637247 is about 349.3518535340.

It can be divided in two parts, 426 and 37247, that added together give a palindrome (37673).

The spelling of 42637247 in words is "forty-two million, six hundred thirty-seven thousand, two hundred forty-seven".