42865807 has 2 divisors, whose sum is σ = 42865808. Its totient is φ = 42865806.

The previous prime is 42865769. The next prime is 42865811. The reversal of 42865807 is 70856824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42865807 - 2¹⁵ = 42833039 is a prime.

It is a super-2 number, since 2×42865807² = 3674954819522498, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42865807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42865847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21432903 + 21432904.

It is an arithmetic number, because the mean of its divisors is an integer number (21432904).

Almost surely, 2^42865807 is an apocalyptic number.

42865807 is a deficient number, since it is larger than the sum of its proper divisors (1).

42865807 is an equidigital number, since it uses as much as digits as its factorization.

42865807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 42865807 is about 6547.1984084798. The cubic root of 42865807 is about 349.9749832459.

The spelling of 42865807 in words is "forty-two million, eight hundred sixty-five thousand, eight hundred seven".