2177989 has 16 divisors (see below), whose sum is σ = 2652480. Its totient is φ = 1762560.

The previous prime is 2177983. The next prime is 2177999. The reversal of 2177989 is 9897712.

It is a happy number.

2177989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2177989 - 2⁵ = 2177957 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 (2177983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3247 + ... + 3859.

It is an arithmetic number, because the mean of its divisors is an integer number (165780).

2^2177989 is an apocalyptic number.

It is an amenable number.

2177989 is a deficient number, since it is larger than the sum of its proper divisors (474491).

2177989 is a wasteful number, since it uses less digits than its factorization.

2177989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660.

The product of its digits is 63504, while the sum is 43.

The square root of 2177989 is about 1475.8011383652. The cubic root of 2177989 is about 129.6239427961.

The spelling of 2177989 in words is "two million, one hundred seventy-seven thousand, nine hundred eighty-nine".