42440197 has 2 divisors, whose sum is σ = 42440198. Its totient is φ = 42440196.

The previous prime is 42440191. The next prime is 42440249. The reversal of 42440197 is 79104424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39614436 + 2825761 = 6294^2 + 1681^2 .

It is a cyclic number.

It is not a de Polignac number, because 42440197 - 2¹⁵ = 42407429 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 (42440191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21220098 + 21220099.

It is an arithmetic number, because the mean of its divisors is an integer number (21220099).

Almost surely, 2^42440197 is an apocalyptic number.

It is an amenable number.

42440197 is a deficient number, since it is larger than the sum of its proper divisors (1).

42440197 is an equidigital number, since it uses as much as digits as its factorization.

42440197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 42440197 is about 6514.6141098303. The cubic root of 42440197 is about 348.8128404296.

The spelling of 42440197 in words is "forty-two million, four hundred forty thousand, one hundred ninety-seven".