2154028789 has 4 divisors (see below), whose sum is σ = 2349849600. Its totient is φ = 1958207980.

The previous prime is 2154028783. The next prime is 2154028801. The reversal of 2154028789 is 9878204512.

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 2154028789 - 2⁹ = 2154028277 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 (2154028783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97910389 + ... + 97910410.

It is an arithmetic number, because the mean of its divisors is an integer number (587462400).

Almost surely, 2^2154028789 is an apocalyptic number.

It is an amenable number.

2154028789 is a deficient number, since it is larger than the sum of its proper divisors (195820811).

2154028789 is a wasteful number, since it uses less digits than its factorization.

2154028789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195820810.

The product of its (nonzero) digits is 322560, while the sum is 46.

The square root of 2154028789 is about 46411.5156938448. The cubic root of 2154028789 is about 1291.4685494953.

The spelling of 2154028789 in words is "two billion, one hundred fifty-four million, twenty-eight thousand, seven hundred eighty-nine".