42247997 has 12 divisors (see below), whose sum is σ = 46911228. Its totient is φ = 38016000.

The previous prime is 42247993. The next prime is 42248021. The reversal of 42247997 is 79974224.

42247997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 19456921 + 22791076 = 4411^2 + 4774^2 .

It is not a de Polignac number, because 42247997 - 2² = 42247993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42247991) 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 in 11 ways as a sum of consecutive naturals, for example, 10493 + ... + 13949.

It is an arithmetic number, because the mean of its divisors is an integer number (3909269).

Almost surely, 2^42247997 is an apocalyptic number.

It is an amenable number.

42247997 is a deficient number, since it is larger than the sum of its proper divisors (4663231).

42247997 is a wasteful number, since it uses less digits than its factorization.

42247997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3580 (or 3569 counting only the distinct ones).

The product of its digits is 254016, while the sum is 44.

The square root of 42247997 is about 6499.8459212507. The cubic root of 42247997 is about 348.2854843478.

Adding to 42247997 its reverse (79974224), we get a palindrome (122222221).

It can be divided in two parts, 4224 and 7997, that added together give a palindrome (12221).

The spelling of 42247997 in words is "forty-two million, two hundred forty-seven thousand, nine hundred ninety-seven".