289290421 has 4 divisors (see below), whose sum is σ = 330617632. Its totient is φ = 247963212.

The previous prime is 289290403. The next prime is 289290431. The reversal of 289290421 is 124092982.

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 not a de Polignac number, because 289290421 - 2⁹ = 289289909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289290431) 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, 20663595 + ... + 20663608.

It is an arithmetic number, because the mean of its divisors is an integer number (82654408).

Almost surely, 2^289290421 is an apocalyptic number.

It is an amenable number.

289290421 is a deficient number, since it is larger than the sum of its proper divisors (41327211).

289290421 is an equidigital number, since it uses as much as digits as its factorization.

289290421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41327210.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 289290421 is about 17008.5396492468. The cubic root of 289290421 is about 661.3702942824.

The spelling of 289290421 in words is "two hundred eighty-nine million, two hundred ninety thousand, four hundred twenty-one".