42397 has 2 divisors, whose sum is σ = 42398. Its totient is φ = 42396.

The previous prime is 42391. The next prime is 42403. The reversal of 42397 is 79324.

It is a balanced prime because it is at equal distance from previous prime (42391) and next prime (42403).

It can be written as a sum of positive squares in only one way, i.e., 37636 + 4761 = 194^2 + 69^2 .

It is a cyclic number.

It is not a de Polignac number, because 42397 - 2¹⁵ = 9629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21198 + 21199.

It is an arithmetic number, because the mean of its divisors is an integer number (21199).

2⁴²³⁹⁷ is an apocalyptic number.

It is an amenable number.

42397 is a deficient number, since it is larger than the sum of its proper divisors (1).

42397 is an equidigital number, since it uses as much as digits as its factorization.

42397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 25.

The square root of 42397 is about 205.9053180469. The cubic root of 42397 is about 34.8694455939.

It can be divided in two parts, 4 and 2397, that added together give a 4-th power (2401 = 7⁴).

The spelling of 42397 in words is "forty-two thousand, three hundred ninety-seven".