42742117 has 4 divisors (see below), whose sum is σ = 46627776. Its totient is φ = 38856460.

The previous prime is 42742111. The next prime is 42742127. The reversal of 42742117 is 71124724.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42742117 - 2¹⁵ = 42709349 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 (42742111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1942813 + ... + 1942834.

It is an arithmetic number, because the mean of its divisors is an integer number (11656944).

Almost surely, 2^42742117 is an apocalyptic number.

It is an amenable number.

42742117 is a deficient number, since it is larger than the sum of its proper divisors (3885659).

42742117 is a wasteful number, since it uses less digits than its factorization.

42742117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3885658.

The product of its digits is 3136, while the sum is 28.

The square root of 42742117 is about 6537.7455594417. The cubic root of 42742117 is about 349.6380394046.

The spelling of 42742117 in words is "forty-two million, seven hundred forty-two thousand, one hundred seventeen".