42138386 has 8 divisors (see below), whose sum is σ = 63448704. Its totient is φ = 20988820.

The previous prime is 42138379. The next prime is 42138391. The reversal of 42138386 is 68383124.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39530 + ... + 40581.

It is an arithmetic number, because the mean of its divisors is an integer number (7931088).

Almost surely, 2^42138386 is an apocalyptic number.

42138386 is a deficient number, since it is larger than the sum of its proper divisors (21310318).

42138386 is a wasteful number, since it uses less digits than its factorization.

42138386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80376.

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

The square root of 42138386 is about 6491.4086298738. The cubic root of 42138386 is about 347.9840185112.

It can be divided in two parts, 42138 and 386, that added together give a palindrome (42524).

The spelling of 42138386 in words is "forty-two million, one hundred thirty-eight thousand, three hundred eighty-six".