205972439 has 4 divisors (see below), whose sum is σ = 206464440. Its totient is φ = 205480440.

The previous prime is 205972423. The next prime is 205972453. The reversal of 205972439 is 934279502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205972439 - 2⁴ = 205972423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205972396 and 205972405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205972409) 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, 245372 + ... + 246209.

It is an arithmetic number, because the mean of its divisors is an integer number (51616110).

Almost surely, 2^205972439 is an apocalyptic number.

205972439 is a deficient number, since it is larger than the sum of its proper divisors (492001).

205972439 is an equidigital number, since it uses as much as digits as its factorization.

205972439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492000.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 205972439 is about 14351.7399293605. The cubic root of 205972439 is about 590.5677184129.

The spelling of 205972439 in words is "two hundred five million, nine hundred seventy-two thousand, four hundred thirty-nine".