288393921 has 12 divisors (see below), whose sum is σ = 417083472. Its totient is φ = 192025176.

The previous prime is 288393907. The next prime is 288393983. The reversal of 288393921 is 129393882.

It is not a de Polignac number, because 288393921 - 2⁶ = 288393857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (288392921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11931 + ... + 26816.

It is an arithmetic number, because the mean of its divisors is an integer number (34756956).

Almost surely, 2^288393921 is an apocalyptic number.

It is an amenable number.

288393921 is a deficient number, since it is larger than the sum of its proper divisors (128689551).

288393921 is a wasteful number, since it uses less digits than its factorization.

288393921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39580 (or 39577 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 288393921 is about 16982.1647913333. The cubic root of 288393921 is about 660.6864002211.

The spelling of 288393921 in words is "two hundred eighty-eight million, three hundred ninety-three thousand, nine hundred twenty-one".