42807823 has 2 divisors, whose sum is σ = 42807824. Its totient is φ = 42807822.

The previous prime is 42807797. The next prime is 42807827. The reversal of 42807823 is 32870824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42807823 - 2²¹ = 40710671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42807827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21403911 + 21403912.

It is an arithmetic number, because the mean of its divisors is an integer number (21403912).

Almost surely, 2^42807823 is an apocalyptic number.

42807823 is a deficient number, since it is larger than the sum of its proper divisors (1).

42807823 is an equidigital number, since it uses as much as digits as its factorization.

42807823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 42807823 is about 6542.7687564211. The cubic root of 42807823 is about 349.8171098908.

The spelling of 42807823 in words is "forty-two million, eight hundred seven thousand, eight hundred twenty-three".