289968421 has 4 divisors (see below), whose sum is σ = 294883200. Its totient is φ = 285053644.

The previous prime is 289968407. The next prime is 289968433. The reversal of 289968421 is 124869982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 289968421 - 2⁷ = 289968293 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289960421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2457301 + ... + 2457418.

It is an arithmetic number, because the mean of its divisors is an integer number (73720800).

Almost surely, 2^289968421 is an apocalyptic number.

It is an amenable number.

289968421 is a deficient number, since it is larger than the sum of its proper divisors (4914779).

289968421 is an equidigital number, since it uses as much as digits as its factorization.

289968421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4914778.

The product of its digits is 497664, while the sum is 49.

The square root of 289968421 is about 17028.4591493182. The cubic root of 289968421 is about 661.8865680975.

The spelling of 289968421 in words is "two hundred eighty-nine million, nine hundred sixty-eight thousand, four hundred twenty-one".