2156020789 has 16 divisors (see below), whose sum is σ = 2348377920. Its totient is φ = 1967529600.

The previous prime is 2156020787. The next prime is 2156020819. The reversal of 2156020789 is 9870206512.

It is a cyclic number.

It is not a de Polignac number, because 2156020789 - 2¹ = 2156020787 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 (2156020787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 834702 + ... + 837280.

It is an arithmetic number, because the mean of its divisors is an integer number (146773620).

Almost surely, 2^2156020789 is an apocalyptic number.

It is an amenable number.

2156020789 is a deficient number, since it is larger than the sum of its proper divisors (192357131).

2156020789 is a wasteful number, since it uses less digits than its factorization.

2156020789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 2156020789 is about 46432.9709258410. The cubic root of 2156020789 is about 1291.8665343846.

The spelling of 2156020789 in words is "two billion, one hundred fifty-six million, twenty thousand, seven hundred eighty-nine".