42397387 has 2 divisors, whose sum is σ = 42397388. Its totient is φ = 42397386.

The previous prime is 42397361. The next prime is 42397409. The reversal of 42397387 is 78379324.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42397387 is a prime.

It is not a weakly prime, because it can be changed into another prime (42397307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21198693 + 21198694.

It is an arithmetic number, because the mean of its divisors is an integer number (21198694).

Almost surely, 2^42397387 is an apocalyptic number.

42397387 is a deficient number, since it is larger than the sum of its proper divisors (1).

42397387 is an equidigital number, since it uses as much as digits as its factorization.

42397387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 43.

The square root of 42397387 is about 6511.3275912060. The cubic root of 42397387 is about 348.6955168975.

The spelling of 42397387 in words is "forty-two million, three hundred ninety-seven thousand, three hundred eighty-seven".