287439813 has 8 divisors (see below), whose sum is σ = 425836800. Its totient is φ = 191626524.

The previous prime is 287439787. The next prime is 287439833. The reversal of 287439813 is 318934782.

It is not a de Polignac number, because 287439813 - 2⁹ = 287439301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287439833) 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, 5322933 + ... + 5322986.

It is an arithmetic number, because the mean of its divisors is an integer number (53229600).

Almost surely, 2^287439813 is an apocalyptic number.

It is an amenable number.

287439813 is a deficient number, since it is larger than the sum of its proper divisors (138396987).

287439813 is a wasteful number, since it uses less digits than its factorization.

287439813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10645928 (or 10645922 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 287439813 is about 16954.0500471126. The cubic root of 287439813 is about 659.9570013310.

The spelling of 287439813 in words is "two hundred eighty-seven million, four hundred thirty-nine thousand, eight hundred thirteen".