287229138 has 32 divisors (see below), whose sum is σ = 659045376. Its totient is φ = 81750288.

The previous prime is 287229097. The next prime is 287229139. The reversal of 287229138 is 831922782.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 287229138.

It is not an unprimeable number, because it can be changed into a prime (287229139) 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 15 ways as a sum of consecutive naturals, for example, 1956 + ... + 24047.

It is an arithmetic number, because the mean of its divisors is an integer number (20595168).

Almost surely, 2^287229138 is an apocalyptic number.

287229138 is an abundant number, since it is smaller than the sum of its proper divisors (371816238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

287229138 is a wasteful number, since it uses less digits than its factorization.

287229138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26278.

The product of its digits is 96768, while the sum is 42.

The square root of 287229138 is about 16947.8357910383. The cubic root of 287229138 is about 659.7957264981.

The spelling of 287229138 in words is "two hundred eighty-seven million, two hundred twenty-nine thousand, one hundred thirty-eight".