135979493 has 8 divisors (see below), whose sum is σ = 150011736. Its totient is φ = 122457600.

The previous prime is 135979469. The next prime is 135979531. The reversal of 135979493 is 394979531.

It can be written as a sum of positive squares in 4 ways, for example, as 6543364 + 129436129 = 2558^2 + 11377^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 135979493 - 2⁶ = 135979429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135979433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127028 + ... + 128093.

It is an arithmetic number, because the mean of its divisors is an integer number (18751467).

Almost surely, 2^135979493 is an apocalyptic number.

135979493 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

135979493 is a deficient number, since it is larger than the sum of its proper divisors (14032243).

135979493 is a wasteful number, since it uses less digits than its factorization.

135979493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255175.

The product of its digits is 918540, while the sum is 50.

The square root of 135979493 is about 11661.0245261726. The cubic root of 135979493 is about 514.2304691502.

The spelling of 135979493 in words is "one hundred thirty-five million, nine hundred seventy-nine thousand, four hundred ninety-three".