205738989 has 16 divisors (see below), whose sum is σ = 281164800. Its totient is φ = 133778736.

The previous prime is 205738957. The next prime is 205738997. The reversal of 205738989 is 989837502.

It is not a de Polignac number, because 205738989 - 2⁵ = 205738957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205738999) 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, 14442 + ... + 24900.

It is an arithmetic number, because the mean of its divisors is an integer number (17572800).

Almost surely, 2^205738989 is an apocalyptic number.

It is an amenable number.

205738989 is a deficient number, since it is larger than the sum of its proper divisors (75425811).

205738989 is a wasteful number, since it uses less digits than its factorization.

205738989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10624.

The product of its (nonzero) digits is 1088640, while the sum is 51.

The square root of 205738989 is about 14343.6044633140. The cubic root of 205738989 is about 590.3445167812.

The spelling of 205738989 in words is "two hundred five million, seven hundred thirty-eight thousand, nine hundred eighty-nine".