205423919 has 8 divisors (see below), whose sum is σ = 210362400. Its totient is φ = 200524896.

The previous prime is 205423913. The next prime is 205423927. The reversal of 205423919 is 919324502.

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 205423919 - 2¹⁶ = 205358383 is a prime.

It is a super-2 number, since 2×205423919² = 84397972994637122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205423913) 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, 809 + ... + 20285.

It is an arithmetic number, because the mean of its divisors is an integer number (26295300).

Almost surely, 2^205423919 is an apocalyptic number.

205423919 is a deficient number, since it is larger than the sum of its proper divisors (4938481).

205423919 is a wasteful number, since it uses less digits than its factorization.

205423919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19729.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 205423919 is about 14332.6173115729. The cubic root of 205423919 is about 590.0430103664.

The spelling of 205423919 in words is "two hundred five million, four hundred twenty-three thousand, nine hundred nineteen".