2120989 has 16 divisors (see below), whose sum is σ = 2490880. Its totient is φ = 1788480.

The previous prime is 2120981. The next prime is 2121011. The reversal of 2120989 is 9890212.

It is a cyclic number.

It is not a de Polignac number, because 2120989 - 2³ = 2120981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2120989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120981) 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, 7519 + ... + 7795.

It is an arithmetic number, because the mean of its divisors is an integer number (155680).

2^2120989 is an apocalyptic number.

It is an amenable number.

2120989 is a deficient number, since it is larger than the sum of its proper divisors (369891).

2120989 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (2120988) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (340).

2120989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 2120989 is about 1456.3615622503. The cubic root of 2120989 is about 128.4831390919.

The spelling of 2120989 in words is "two million, one hundred twenty thousand, nine hundred eighty-nine".