42387197 has 2 divisors, whose sum is σ = 42387198. Its totient is φ = 42387196.

The previous prime is 42387179. The next prime is 42387211. The reversal of 42387197 is 79178324.

42387197 is nontrivially palindromic in base 13.

Together with previous prime (42387179) 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., 39363076 + 3024121 = 6274^2 + 1739^2 .

It is a cyclic number.

It is not a de Polignac number, because 42387197 - 2⁶ = 42387133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42387167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21193598 + 21193599.

It is an arithmetic number, because the mean of its divisors is an integer number (21193599).

Almost surely, 2^42387197 is an apocalyptic number.

It is an amenable number.

42387197 is a deficient number, since it is larger than the sum of its proper divisors (1).

42387197 is an equidigital number, since it uses as much as digits as its factorization.

42387197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The square root of 42387197 is about 6510.5450616673. The cubic root of 42387197 is about 348.6675789177.

The spelling of 42387197 in words is "forty-two million, three hundred eighty-seven thousand, one hundred ninety-seven".