42647447 has 2 divisors, whose sum is σ = 42647448. Its totient is φ = 42647446.

The previous prime is 42647417. The next prime is 42647453. The reversal of 42647447 is 74474624.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42647447 - 2¹⁴ = 42631063 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42647447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42647417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21323723 + 21323724.

It is an arithmetic number, because the mean of its divisors is an integer number (21323724).

Almost surely, 2^42647447 is an apocalyptic number.

42647447 is a deficient number, since it is larger than the sum of its proper divisors (1).

42647447 is an equidigital number, since it uses as much as digits as its factorization.

42647447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 38.

The square root of 42647447 is about 6530.5012824438. The cubic root of 42647447 is about 349.3797094975.

It can be divided in two parts, 4264 and 7447, that added together give a palindrome (11711).

The spelling of 42647447 in words is "forty-two million, six hundred forty-seven thousand, four hundred forty-seven".