42742647 has 20 divisors (see below), whose sum is σ = 67213080. Its totient is φ = 26994384.

The previous prime is 42742619. The next prime is 42742649. The reversal of 42742647 is 74624724.

It is a happy number.

42742647 is a `hidden beast` number, since 4 + 2 + 7 + 4 + 2 + 647 = 666.

It is not a de Polignac number, because 42742647 - 2¹⁹ = 42218359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42742649) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12348 + ... + 15425.

It is an arithmetic number, because the mean of its divisors is an integer number (3360654).

Almost surely, 2^42742647 is an apocalyptic number.

42742647 is a deficient number, since it is larger than the sum of its proper divisors (24470433).

42742647 is a wasteful number, since it uses less digits than its factorization.

42742647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27804 (or 27795 counting only the distinct ones).

The product of its digits is 75264, while the sum is 36.

The square root of 42742647 is about 6537.7860931664. The cubic root of 42742647 is about 349.6394845630.

The spelling of 42742647 in words is "forty-two million, seven hundred forty-two thousand, six hundred forty-seven".