42197818 has 16 divisors (see below), whose sum is σ = 68554080. Its totient is φ = 19364976.

The previous prime is 42197807. The next prime is 42197819. The reversal of 42197818 is 81879124.

It is a happy number.

42197818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×42197818² = 3561311687922248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42197819) 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 7 ways as a sum of consecutive naturals, for example, 121 + ... + 9187.

It is an arithmetic number, because the mean of its divisors is an integer number (4284630).

Almost surely, 2^42197818 is an apocalyptic number.

42197818 is a deficient number, since it is larger than the sum of its proper divisors (26356262).

42197818 is a wasteful number, since it uses less digits than its factorization.

42197818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9261.

The product of its digits is 32256, while the sum is 40.

The square root of 42197818 is about 6495.9847598343. The cubic root of 42197818 is about 348.1475406008.

The spelling of 42197818 in words is "forty-two million, one hundred ninety-seven thousand, eight hundred eighteen".