135440423 has 2 divisors, whose sum is σ = 135440424. Its totient is φ = 135440422.

The previous prime is 135440413. The next prime is 135440441. The reversal of 135440423 is 324044531.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 135440423 - 2⁴ = 135440407 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135440392 and 135440401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135440413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67720211 + 67720212.

It is an arithmetic number, because the mean of its divisors is an integer number (67720212).

Almost surely, 2^135440423 is an apocalyptic number.

135440423 is a deficient number, since it is larger than the sum of its proper divisors (1).

135440423 is an equidigital number, since it uses as much as digits as its factorization.

135440423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 135440423 is about 11637.8873941966. The cubic root of 135440423 is about 513.5500397322.

Adding to 135440423 its reverse (324044531), we get a palindrome (459484954).

The spelling of 135440423 in words is "one hundred thirty-five million, four hundred forty thousand, four hundred twenty-three".