287400989 has 8 divisors (see below), whose sum is σ = 292030080. Its totient is φ = 282782016.

The previous prime is 287400983. The next prime is 287401001. The reversal of 287400989 is 989004782.

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 287400989 - 2⁸ = 287400733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287400983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71957 + ... + 75845.

It is an arithmetic number, because the mean of its divisors is an integer number (36503760).

Almost surely, 2^287400989 is an apocalyptic number.

It is an amenable number.

287400989 is a deficient number, since it is larger than the sum of its proper divisors (4629091).

287400989 is a wasteful number, since it uses less digits than its factorization.

287400989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5059.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 287400989 is about 16952.9050312918. The cubic root of 287400989 is about 659.9272869083.

The spelling of 287400989 in words is "two hundred eighty-seven million, four hundred thousand, nine hundred eighty-nine".