204697987 has 8 divisors (see below), whose sum is σ = 220680320. Its totient is φ = 188749440.

The previous prime is 204697981. The next prime is 204698009. The reversal of 204697987 is 789796402.

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 204697987 - 2⁷ = 204697859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204697981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4939 + ... + 20827.

It is an arithmetic number, because the mean of its divisors is an integer number (27585040).

Almost surely, 2^204697987 is an apocalyptic number.

204697987 is a deficient number, since it is larger than the sum of its proper divisors (15982333).

204697987 is a wasteful number, since it uses less digits than its factorization.

204697987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16893.

The product of its (nonzero) digits is 1524096, while the sum is 52.

The square root of 204697987 is about 14307.2704245080. The cubic root of 204697987 is about 589.3471539694.

The spelling of 204697987 in words is "two hundred four million, six hundred ninety-seven thousand, nine hundred eighty-seven".