42000247 has 2 divisors, whose sum is σ = 42000248. Its totient is φ = 42000246.

The previous prime is 42000199. The next prime is 42000289. The reversal of 42000247 is 74200024.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42000247 is a prime.

It is a super-2 number, since 2×42000247² = 3528041496122018, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42000947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21000123 + 21000124.

It is an arithmetic number, because the mean of its divisors is an integer number (21000124).

Almost surely, 2^42000247 is an apocalyptic number.

42000247 is a deficient number, since it is larger than the sum of its proper divisors (1).

42000247 is an equidigital number, since it uses as much as digits as its factorization.

42000247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 19.

The square root of 42000247 is about 6480.7597548436. The cubic root of 42000247 is about 347.6033458989.

The spelling of 42000247 in words is "forty-two million, two hundred forty-seven", and thus it is an aban number.