42399197 has 2 divisors, whose sum is σ = 42399198. Its totient is φ = 42399196.

The previous prime is 42399179. The next prime is 42399211. The reversal of 42399197 is 79199324.

Together with previous prime (42399179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39262756 + 3136441 = 6266^2 + 1771^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42399197 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 (42399107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21199598 + 21199599.

It is an arithmetic number, because the mean of its divisors is an integer number (21199599).

Almost surely, 2^42399197 is an apocalyptic number.

It is an amenable number.

42399197 is a deficient number, since it is larger than the sum of its proper divisors (1).

42399197 is an equidigital number, since it uses as much as digits as its factorization.

42399197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 44.

The square root of 42399197 is about 6511.4665782756. The cubic root of 42399197 is about 348.7004789164.

The spelling of 42399197 in words is "forty-two million, three hundred ninety-nine thousand, one hundred ninety-seven".