288138217 has 4 divisors (see below), whose sum is σ = 288395920. Its totient is φ = 287880516.

The previous prime is 288138187. The next prime is 288138259. The reversal of 288138217 is 712831882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 288138217 - 2¹⁹ = 287613929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 288138217.

It is not an unprimeable number, because it can be changed into a prime (288138817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127167 + ... + 129412.

It is an arithmetic number, because the mean of its divisors is an integer number (72098980).

Almost surely, 2^288138217 is an apocalyptic number.

It is an amenable number.

288138217 is a deficient number, since it is larger than the sum of its proper divisors (257703).

288138217 is a wasteful number, since it uses less digits than its factorization.

288138217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257702.

The product of its digits is 43008, while the sum is 40.

The square root of 288138217 is about 16974.6345174204. The cubic root of 288138217 is about 660.4910769754.

The spelling of 288138217 in words is "two hundred eighty-eight million, one hundred thirty-eight thousand, two hundred seventeen".