42138695 has 4 divisors (see below), whose sum is σ = 50566440. Its totient is φ = 33710952.

The previous prime is 42138689. The next prime is 42138781. The reversal of 42138695 is 59683124.

It is a happy number.

42138695 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42138695 is a prime.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4213865 + ... + 4213874.

It is an arithmetic number, because the mean of its divisors is an integer number (12641610).

Almost surely, 2^42138695 is an apocalyptic number.

42138695 is a deficient number, since it is larger than the sum of its proper divisors (8427745).

42138695 is an equidigital number, since it uses as much as digits as its factorization.

42138695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8427744.

The product of its digits is 51840, while the sum is 38.

The square root of 42138695 is about 6491.4324305195. The cubic root of 42138695 is about 347.9848690959.

The spelling of 42138695 in words is "forty-two million, one hundred thirty-eight thousand, six hundred ninety-five".