289740393 has 18 divisors (see below), whose sum is σ = 421026606. Its totient is φ = 192006912.

The previous prime is 289740391. The next prime is 289740403. The reversal of 289740393 is 393047982.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 5076009 + 284664384 = 2253^2 + 16872^2 .

It is not a de Polignac number, because 289740393 - 2¹ = 289740391 is a prime.

It is not an unprimeable number, because it can be changed into a prime (289740391) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 488305 + ... + 488897.

It is an arithmetic number, because the mean of its divisors is an integer number (23390367).

Almost surely, 2^289740393 is an apocalyptic number.

It is an amenable number.

289740393 is a deficient number, since it is larger than the sum of its proper divisors (131286213).

289740393 is an equidigital number, since it uses as much as digits as its factorization.

289740393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065 (or 829 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 289740393 is about 17021.7623353165. The cubic root of 289740393 is about 661.7130224749.

The spelling of 289740393 in words is "two hundred eighty-nine million, seven hundred forty thousand, three hundred ninety-three".