42318638 has 4 divisors (see below), whose sum is σ = 63477960. Its totient is φ = 21159318.

The previous prime is 42318631. The next prime is 42318649. The reversal of 42318638 is 83681324.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42318598 and 42318607.

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 as a sum of consecutive naturals, namely, 10579658 + ... + 10579661.

It is an arithmetic number, because the mean of its divisors is an integer number (15869490).

Almost surely, 2^42318638 is an apocalyptic number.

42318638 is a deficient number, since it is larger than the sum of its proper divisors (21159322).

42318638 is a wasteful number, since it uses less digits than its factorization.

42318638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21159321.

The product of its digits is 27648, while the sum is 35.

The square root of 42318638 is about 6505.2777035266. The cubic root of 42318638 is about 348.4794938213.

The spelling of 42318638 in words is "forty-two million, three hundred eighteen thousand, six hundred thirty-eight".