136823999 has 4 divisors (see below), whose sum is σ = 147348936. Its totient is φ = 126299064.

The previous prime is 136823989. The next prime is 136824043. The reversal of 136823999 is 999328631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999328631 = 7 ⋅142761233.

It is a cyclic number.

It is not a de Polignac number, because 136823999 - 2¹⁶ = 136758463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136823989) 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, 5262449 + ... + 5262474.

It is an arithmetic number, because the mean of its divisors is an integer number (36837234).

Almost surely, 2^136823999 is an apocalyptic number.

136823999 is a deficient number, since it is larger than the sum of its proper divisors (10524937).

136823999 is a wasteful number, since it uses less digits than its factorization.

136823999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10524936.

The product of its digits is 629856, while the sum is 50.

The square root of 136823999 is about 11697.1791043824. The cubic root of 136823999 is about 515.2928224450.

The spelling of 136823999 in words is "one hundred thirty-six million, eight hundred twenty-three thousand, nine hundred ninety-nine".