2101989 has 8 divisors (see below), whose sum is σ = 2950240. Its totient is φ = 1327536.

The previous prime is 2101961. The next prime is 2102021. The reversal of 2101989 is 9891012.

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

It is not a de Polignac number, because 2101989 - 2⁸ = 2101733 is a prime.

It is a super-2 number, since 2×2101989² = 8836715512242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101909) 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, 18382 + ... + 18495.

It is an arithmetic number, because the mean of its divisors is an integer number (368780).

2^2101989 is an apocalyptic number.

It is an amenable number.

2101989 is a deficient number, since it is larger than the sum of its proper divisors (848251).

2101989 is a wasteful number, since it uses less digits than its factorization.

2101989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36899.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 2101989 is about 1449.8237823956. The cubic root of 2101989 is about 128.0983334549.

The spelling of 2101989 in words is "two million, one hundred one thousand, nine hundred eighty-nine".