42538723 has 2 divisors, whose sum is σ = 42538724. Its totient is φ = 42538722.

The previous prime is 42538693. The next prime is 42538729. The reversal of 42538723 is 32783524.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42538723 - 2²¹ = 40441571 is a prime.

It is not a weakly prime, because it can be changed into another prime (42538729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21269361 + 21269362.

It is an arithmetic number, because the mean of its divisors is an integer number (21269362).

Almost surely, 2^42538723 is an apocalyptic number.

42538723 is a deficient number, since it is larger than the sum of its proper divisors (1).

42538723 is an equidigital number, since it uses as much as digits as its factorization.

42538723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 34.

The square root of 42538723 is about 6522.1716475419. The cubic root of 42538723 is about 349.0825577877.

The spelling of 42538723 in words is "forty-two million, five hundred thirty-eight thousand, seven hundred twenty-three".