42856207 has 2 divisors, whose sum is σ = 42856208. Its totient is φ = 42856206.

The previous prime is 42856169. The next prime is 42856213. The reversal of 42856207 is 70265824.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42856207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42856217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21428103 + 21428104.

It is an arithmetic number, because the mean of its divisors is an integer number (21428104).

Almost surely, 2^42856207 is an apocalyptic number.

42856207 is a deficient number, since it is larger than the sum of its proper divisors (1).

42856207 is an equidigital number, since it uses as much as digits as its factorization.

42856207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 42856207 is about 6546.4652294196. The cubic root of 42856207 is about 349.9488551117.

The spelling of 42856207 in words is "forty-two million, eight hundred fifty-six thousand, two hundred seven".