42388547 has 4 divisors (see below), whose sum is σ = 43422456. Its totient is φ = 41354640.

The previous prime is 42388543. The next prime is 42388559. The reversal of 42388547 is 74588324.

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

It is a cyclic number.

It is not a de Polignac number, because 42388547 - 2² = 42388543 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 1033867 = 42388547 / (4 + 2 + 3 + 8 + 8 + 5 + 4 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42388543) 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, 516893 + ... + 516974.

It is an arithmetic number, because the mean of its divisors is an integer number (10855614).

Almost surely, 2^42388547 is an apocalyptic number.

42388547 is a deficient number, since it is larger than the sum of its proper divisors (1033909).

42388547 is a wasteful number, since it uses less digits than its factorization.

42388547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033908.

The product of its digits is 215040, while the sum is 41.

The square root of 42388547 is about 6510.6487387971. The cubic root of 42388547 is about 348.6712804776.

The spelling of 42388547 in words is "forty-two million, three hundred eighty-eight thousand, five hundred forty-seven".