135408623 has 4 divisors (see below), whose sum is σ = 154752720. Its totient is φ = 116064528.

The previous prime is 135408619. The next prime is 135408631. The reversal of 135408623 is 326804531.

135408623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326804531 = 149 ⋅2193319.

It is a cyclic number.

It is not a de Polignac number, because 135408623 - 2² = 135408619 is a prime.

It is a super-2 number, since 2×135408623² = 36670990365512258, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135408623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135408683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9672038 + ... + 9672051.

It is an arithmetic number, because the mean of its divisors is an integer number (38688180).

Almost surely, 2^135408623 is an apocalyptic number.

135408623 is a deficient number, since it is larger than the sum of its proper divisors (19344097).

135408623 is an equidigital number, since it uses as much as digits as its factorization.

135408623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19344096.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 135408623 is about 11636.5210866478. The cubic root of 135408623 is about 513.5098445202.

The spelling of 135408623 in words is "one hundred thirty-five million, four hundred eight thousand, six hundred twenty-three".