42318639 has 32 divisors (see below), whose sum is σ = 70260480. Its totient is φ = 24948000.

The previous prime is 42318631. The next prime is 42318649. The reversal of 42318639 is 93681324.

42318639 is a `hidden beast` number, since 4 + 2 + 3 + 18 + 639 = 666.

It is not a de Polignac number, because 42318639 - 2³ = 42318631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42318631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9064 + ... + 12914.

It is an arithmetic number, because the mean of its divisors is an integer number (2195640).

Almost surely, 2^42318639 is an apocalyptic number.

42318639 is a deficient number, since it is larger than the sum of its proper divisors (27941841).

42318639 is a wasteful number, since it uses less digits than its factorization.

42318639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3908 (or 3902 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 42318639 is about 6505.2777803872. The cubic root of 42318639 is about 348.4794965662.

The spelling of 42318639 in words is "forty-two million, three hundred eighteen thousand, six hundred thirty-nine".