289788921 has 48 divisors (see below), whose sum is σ = 450812544. Its totient is φ = 185877504.

The previous prime is 289788913. The next prime is 289788971. The reversal of 289788921 is 129887982.

It is not a de Polignac number, because 289788921 - 2³ = 289788913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (289788971) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1501401 + ... + 1501593.

It is an arithmetic number, because the mean of its divisors is an integer number (9391928).

Almost surely, 2^289788921 is an apocalyptic number.

It is an amenable number.

289788921 is a deficient number, since it is larger than the sum of its proper divisors (161023623).

289788921 is a wasteful number, since it uses less digits than its factorization.

289788921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412 (or 400 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The square root of 289788921 is about 17023.1877449554. The cubic root of 289788921 is about 661.7499633798.

The spelling of 289788921 in words is "two hundred eighty-nine million, seven hundred eighty-eight thousand, nine hundred twenty-one".