42187697 has 2 divisors, whose sum is σ = 42187698. Its totient is φ = 42187696.

The previous prime is 42187669. The next prime is 42187709. The reversal of 42187697 is 79678124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26946481 + 15241216 = 5191^2 + 3904^2 .

It is a cyclic number.

It is not a de Polignac number, because 42187697 - 2⁸ = 42187441 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42187637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21093848 + 21093849.

It is an arithmetic number, because the mean of its divisors is an integer number (21093849).

Almost surely, 2^42187697 is an apocalyptic number.

It is an amenable number.

42187697 is a deficient number, since it is larger than the sum of its proper divisors (1).

42187697 is an equidigital number, since it uses as much as digits as its factorization.

42187697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 44.

The square root of 42187697 is about 6495.2056934327. The cubic root of 42187697 is about 348.1197043826.

The spelling of 42187697 in words is "forty-two million, one hundred eighty-seven thousand, six hundred ninety-seven".