205042387 has 8 divisors (see below), whose sum is σ = 224204400. Its totient is φ = 185967360.

The previous prime is 205042381. The next prime is 205042393. The reversal of 205042387 is 783240502.

205042387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (205042381) and next prime (205042393).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205042387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205042381) 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, 16762 + ... + 26287.

It is an arithmetic number, because the mean of its divisors is an integer number (28025550).

Almost surely, 2^205042387 is an apocalyptic number.

205042387 is a deficient number, since it is larger than the sum of its proper divisors (19162013).

205042387 is a wasteful number, since it uses less digits than its factorization.

205042387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43493.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 205042387 is about 14319.3012050170. The cubic root of 205042387 is about 589.6774901189.

Adding to 205042387 its reverse (783240502), we get a palindrome (988282889).

The spelling of 205042387 in words is "two hundred five million, forty-two thousand, three hundred eighty-seven".