135928138 has 4 divisors (see below), whose sum is σ = 203892210. Its totient is φ = 67964068.

The previous prime is 135928103. The next prime is 135928139. The reversal of 135928138 is 831829531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831829531 = 13 ⋅63986887.

It can be written as a sum of positive squares in only one way, i.e., 135419769 + 508369 = 11637^2 + 713^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 135928138.

It is not an unprimeable number, because it can be changed into a prime (135928139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33982033 + ... + 33982036.

Almost surely, 2^135928138 is an apocalyptic number.

135928138 is a deficient number, since it is larger than the sum of its proper divisors (67964072).

135928138 is an equidigital number, since it uses as much as digits as its factorization.

135928138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67964071.

The product of its digits is 51840, while the sum is 40.

The square root of 135928138 is about 11658.8223247462. The cubic root of 135928138 is about 514.1657249981.

The spelling of 135928138 in words is "one hundred thirty-five million, nine hundred twenty-eight thousand, one hundred thirty-eight".