289039240 has 64 divisors (see below), whose sum is σ = 758448000. Its totient is φ = 99094464.

The previous prime is 289039211. The next prime is 289039243. The reversal of 289039240 is 42930982.

It is a self number, because there is not a number n which added to its sum of digits gives 289039240.

It is not an unprimeable number, because it can be changed into a prime (289039243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3187 + ... + 24253.

It is an arithmetic number, because the mean of its divisors is an integer number (11850750).

Almost surely, 2^289039240 is an apocalyptic number.

289039240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 289039240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (379224000).

289039240 is an abundant number, since it is smaller than the sum of its proper divisors (469408760).

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

289039240 is a wasteful number, since it uses less digits than its factorization.

289039240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21099 (or 21081 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 289039240 is about 17001.1540784736. The cubic root of 289039240 is about 661.1788237706.

The spelling of 289039240 in words is "two hundred eighty-nine million, thirty-nine thousand, two hundred forty".