205392391 has 8 divisors (see below), whose sum is σ = 212212224. Its totient is φ = 198584760.

The previous prime is 205392379. The next prime is 205392409. The reversal of 205392391 is 193293502.

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

It is not a de Polignac number, because 205392391 - 2⁷ = 205392263 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 (205392311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41916 + ... + 46558.

It is an arithmetic number, because the mean of its divisors is an integer number (26526528).

Almost surely, 2^205392391 is an apocalyptic number.

205392391 is a deficient number, since it is larger than the sum of its proper divisors (6819833).

205392391 is a wasteful number, since it uses less digits than its factorization.

205392391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6101.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 205392391 is about 14331.5174004709. The cubic root of 205392391 is about 590.0128226649.

The spelling of 205392391 in words is "two hundred five million, three hundred ninety-two thousand, three hundred ninety-one".