42987547 has 2 divisors, whose sum is σ = 42987548. Its totient is φ = 42987546.

The previous prime is 42987533. The next prime is 42987569. The reversal of 42987547 is 74578924.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42987547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42987497 and 42987506.

It is not a weakly prime, because it can be changed into another prime (42987517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21493773 + 21493774.

It is an arithmetic number, because the mean of its divisors is an integer number (21493774).

Almost surely, 2^42987547 is an apocalyptic number.

42987547 is a deficient number, since it is larger than the sum of its proper divisors (1).

42987547 is an equidigital number, since it uses as much as digits as its factorization.

42987547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 564480, while the sum is 46.

The square root of 42987547 is about 6556.4889231966. The cubic root of 42987547 is about 350.3059827609.

It can be divided in two parts, 42987 and 547, that added together give a palindrome (43534).

The spelling of 42987547 in words is "forty-two million, nine hundred eighty-seven thousand, five hundred forty-seven".