135139923 has 6 divisors (see below), whose sum is σ = 195202124. Its totient is φ = 90093276.

The previous prime is 135139903. The next prime is 135139957. The reversal of 135139923 is 329931531.

It is not a de Polignac number, because 135139923 - 2⁶ = 135139859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135139903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7507765 + ... + 7507782.

Almost surely, 2^135139923 is an apocalyptic number.

135139923 is a deficient number, since it is larger than the sum of its proper divisors (60062201).

135139923 is a wasteful number, since it uses less digits than its factorization.

135139923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15015553 (or 15015550 counting only the distinct ones).

The product of its digits is 21870, while the sum is 36.

The square root of 135139923 is about 11624.9698064124. The cubic root of 135139923 is about 513.1699561131.

It can be divided in two parts, 13513 and 9923, that added together give a triangular number (23436 = T₂₁₆).

The spelling of 135139923 in words is "one hundred thirty-five million, one hundred thirty-nine thousand, nine hundred twenty-three".