205136399 has 16 divisors (see below), whose sum is σ = 240242688. Its totient is φ = 173394432.

The previous prime is 205136387. The next prime is 205136411. The reversal of 205136399 is 993631502.

It is an interprime number because it is at equal distance from previous prime (205136387) and next prime (205136411).

It is not a de Polignac number, because 205136399 - 2⁴ = 205136383 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 (208136399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4367 + ... + 20720.

It is an arithmetic number, because the mean of its divisors is an integer number (15015168).

Almost surely, 2^205136399 is an apocalyptic number.

205136399 is a deficient number, since it is larger than the sum of its proper divisors (35106289).

205136399 is a wasteful number, since it uses less digits than its factorization.

205136399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25154.

The product of its (nonzero) digits is 43740, while the sum is 38.

The square root of 205136399 is about 14322.5835309137. The cubic root of 205136399 is about 589.7675987880.

The spelling of 205136399 in words is "two hundred five million, one hundred thirty-six thousand, three hundred ninety-nine".