135398618 has 4 divisors (see below), whose sum is σ = 203097930. Its totient is φ = 67699308.

The previous prime is 135398611. The next prime is 135398621. The reversal of 135398618 is 816893531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 816893531 = 89 ⋅9178579.

It can be written as a sum of positive squares in only one way, i.e., 134490409 + 908209 = 11597^2 + 953^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (135398611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33849653 + ... + 33849656.

Almost surely, 2^135398618 is an apocalyptic number.

135398618 is a deficient number, since it is larger than the sum of its proper divisors (67699312).

135398618 is an equidigital number, since it uses as much as digits as its factorization.

135398618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67699311.

The product of its digits is 155520, while the sum is 44.

The square root of 135398618 is about 11636.0911821797. The cubic root of 135398618 is about 513.4971968950.

The spelling of 135398618 in words is "one hundred thirty-five million, three hundred ninety-eight thousand, six hundred eighteen".