42195397 has 4 divisors (see below), whose sum is σ = 42414220. Its totient is φ = 41976576.

The previous prime is 42195383. The next prime is 42195403. The reversal of 42195397 is 79359124.

42195397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20349121 + 21846276 = 4511^2 + 4674^2 .

It is a cyclic number.

It is not a de Polignac number, because 42195397 - 2¹⁹ = 41671109 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 (42195337) 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 3 ways as a sum of consecutive naturals, for example, 109122 + ... + 109507.

It is an arithmetic number, because the mean of its divisors is an integer number (10603555).

Almost surely, 2^42195397 is an apocalyptic number.

It is an amenable number.

42195397 is a deficient number, since it is larger than the sum of its proper divisors (218823).

42195397 is a wasteful number, since it uses less digits than its factorization.

42195397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218822.

The product of its digits is 68040, while the sum is 40.

The square root of 42195397 is about 6495.7984112809. The cubic root of 42195397 is about 348.1408824262.

The spelling of 42195397 in words is "forty-two million, one hundred ninety-five thousand, three hundred ninety-seven".