42847397 has 2 divisors, whose sum is σ = 42847398. Its totient is φ = 42847396.

The previous prime is 42847391. The next prime is 42847411. The reversal of 42847397 is 79374824.

42847397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42393121 + 454276 = 6511^2 + 674^2 .

It is a cyclic number.

It is not a de Polignac number, because 42847397 - 2⁸ = 42847141 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42847391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21423698 + 21423699.

It is an arithmetic number, because the mean of its divisors is an integer number (21423699).

Almost surely, 2^42847397 is an apocalyptic number.

It is an amenable number.

42847397 is a deficient number, since it is larger than the sum of its proper divisors (1).

42847397 is an equidigital number, since it uses as much as digits as its factorization.

42847397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 44.

The square root of 42847397 is about 6545.7923126234. The cubic root of 42847397 is about 349.9248736715.

Adding to 42847397 its reverse (79374824), we get a palindrome (122222221).

The spelling of 42847397 in words is "forty-two million, eight hundred forty-seven thousand, three hundred ninety-seven".