286789993 has 6 divisors (see below), whose sum is σ = 333612906. Its totient is φ = 245819952.

The previous prime is 286789981. The next prime is 286789999. The reversal of 286789993 is 399987682.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 286726489 + 63504 = 16933^2 + 252^2 .

It is a de Polignac number, because none of the positive numbers 2^k-286789993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (286789999) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2926380 + ... + 2926477.

It is an arithmetic number, because the mean of its divisors is an integer number (55602151).

Almost surely, 2^286789993 is an apocalyptic number.

It is an amenable number.

286789993 is a deficient number, since it is larger than the sum of its proper divisors (46822913).

286789993 is an equidigital number, since it uses as much as digits as its factorization.

286789993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5852871 (or 5852864 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 61.

The square root of 286789993 is about 16934.8750512072. The cubic root of 286789993 is about 659.4593008065.

It can be divided in two parts, 286789 and 993, that added together give a palindrome (287782).

The spelling of 286789993 in words is "two hundred eighty-six million, seven hundred eighty-nine thousand, nine hundred ninety-three".