42664837 has 2 divisors, whose sum is σ = 42664838. Its totient is φ = 42664836.

The previous prime is 42664813. The next prime is 42664871. The reversal of 42664837 is 73846624.

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., 24295041 + 18369796 = 4929^2 + 4286^2 .

It is a cyclic number.

It is not a de Polignac number, because 42664837 - 2¹⁵ = 42632069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42664837.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42667837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21332418 + 21332419.

It is an arithmetic number, because the mean of its divisors is an integer number (21332419).

Almost surely, 2^42664837 is an apocalyptic number.

It is an amenable number.

42664837 is a deficient number, since it is larger than the sum of its proper divisors (1).

42664837 is an equidigital number, since it uses as much as digits as its factorization.

42664837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 40.

The square root of 42664837 is about 6531.8325912411. The cubic root of 42664837 is about 349.4271909448.

The spelling of 42664837 in words is "forty-two million, six hundred sixty-four thousand, eight hundred thirty-seven".