42523823 has 2 divisors, whose sum is σ = 42523824. Its totient is φ = 42523822.

The previous prime is 42523801. The next prime is 42523879. The reversal of 42523823 is 32832524.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42523823 - 2¹⁸ = 42261679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42523123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21261911 + 21261912.

It is an arithmetic number, because the mean of its divisors is an integer number (21261912).

Almost surely, 2^42523823 is an apocalyptic number.

42523823 is a deficient number, since it is larger than the sum of its proper divisors (1).

42523823 is an equidigital number, since it uses as much as digits as its factorization.

42523823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 29.

The square root of 42523823 is about 6521.0292899204. The cubic root of 42523823 is about 349.0417954176.

The spelling of 42523823 in words is "forty-two million, five hundred twenty-three thousand, eight hundred twenty-three".