42639237 has 8 divisors (see below), whose sum is σ = 63169280. Its totient is φ = 28426140.

The previous prime is 42639169. The next prime is 42639239. The reversal of 42639237 is 73293624.

It is a happy number.

42639237 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42639237 - 2⁷ = 42639109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42639239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 789589 + ... + 789642.

It is an arithmetic number, because the mean of its divisors is an integer number (7896160).

Almost surely, 2^42639237 is an apocalyptic number.

It is an amenable number.

42639237 is a deficient number, since it is larger than the sum of its proper divisors (20530043).

42639237 is a wasteful number, since it uses less digits than its factorization.

42639237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1579240 (or 1579234 counting only the distinct ones).

The product of its digits is 54432, while the sum is 36.

The square root of 42639237 is about 6529.8726633833. The cubic root of 42639237 is about 349.3572885267.

The spelling of 42639237 in words is "forty-two million, six hundred thirty-nine thousand, two hundred thirty-seven".