42136723 has 2 divisors, whose sum is σ = 42136724. Its totient is φ = 42136722.

The previous prime is 42136709. The next prime is 42136741. The reversal of 42136723 is 32763124.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42136723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42136691 and 42136700.

It is not a weakly prime, because it can be changed into another prime (42136763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21068361 + 21068362.

It is an arithmetic number, because the mean of its divisors is an integer number (21068362).

Almost surely, 2^42136723 is an apocalyptic number.

42136723 is a deficient number, since it is larger than the sum of its proper divisors (1).

42136723 is an equidigital number, since it uses as much as digits as its factorization.

42136723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 28.

The square root of 42136723 is about 6491.2805362270. The cubic root of 42136723 is about 347.9794406976.

Adding to 42136723 its reverse (32763124), we get a palindrome (74899847).

The spelling of 42136723 in words is "forty-two million, one hundred thirty-six thousand, seven hundred twenty-three".