286387989 has 8 divisors (see below), whose sum is σ = 383490432. Its totient is φ = 190105440.

The previous prime is 286387987. The next prime is 286388033. The reversal of 286387989 is 989783682.

286387989 = 5637² + 5638² + ... + 5645².

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

It is not a de Polignac number, because 286387989 - 2¹ = 286387987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (286387987) 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, 204157 + ... + 205554.

It is an arithmetic number, because the mean of its divisors is an integer number (47936304).

Almost surely, 2^286387989 is an apocalyptic number.

It is an amenable number.

286387989 is a deficient number, since it is larger than the sum of its proper divisors (97102443).

286387989 is a wasteful number, since it uses less digits than its factorization.

286387989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409947.

The product of its digits is 10450944, while the sum is 60.

The square root of 286387989 is about 16923.0017727352. The cubic root of 286387989 is about 659.1510273323.

Subtracting from 286387989 its sum of digits (60), we obtain a square (286387929 = 16923²).

The spelling of 286387989 in words is "two hundred eighty-six million, three hundred eighty-seven thousand, nine hundred eighty-nine".