288022393 has 4 divisors (see below), whose sum is σ = 295806820. Its totient is φ = 280237968.

The previous prime is 288022379. The next prime is 288022421. The reversal of 288022393 is 393220882.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 393220882 = 2 ⋅196610441.

It can be written as a sum of positive squares in 2 ways, for example, as 279658729 + 8363664 = 16723^2 + 2892^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-288022393 is a prime.

It is a super-3 number, since 3×288022393³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 7784389 = 288022393 / (2 + 8 + 8 + 0 + 2 + 2 + 3 + 9 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (288022373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3892158 + ... + 3892231.

It is an arithmetic number, because the mean of its divisors is an integer number (73951705).

Almost surely, 2^288022393 is an apocalyptic number.

288022393 is the 9072-nd centered heptagonal number.

It is an amenable number.

288022393 is a deficient number, since it is larger than the sum of its proper divisors (7784427).

288022393 is an equidigital number, since it uses as much as digits as its factorization.

288022393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7784426.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 288022393 is about 16971.2224957426. Note that the first 3 decimals coincide. The cubic root of 288022393 is about 660.4025650892.

The spelling of 288022393 in words is "two hundred eighty-eight million, twenty-two thousand, three hundred ninety-three".