2121789 has 8 divisors (see below), whose sum is σ = 2851840. Its totient is φ = 1403136.

The previous prime is 2121781. The next prime is 2121793. The reversal of 2121789 is 9871212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2121789 - 2³ = 2121781 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 (2121781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2404 + ... + 3165.

It is an arithmetic number, because the mean of its divisors is an integer number (356480).

2^2121789 is an apocalyptic number.

It is an amenable number.

2121789 is a deficient number, since it is larger than the sum of its proper divisors (730051).

2121789 is a wasteful number, since it uses less digits than its factorization.

2121789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5699.

The product of its digits is 2016, while the sum is 30.

The square root of 2121789 is about 1456.6361934265. The cubic root of 2121789 is about 128.4992909266.

The spelling of 2121789 in words is "two million, one hundred twenty-one thousand, seven hundred eighty-nine".