2164890 has 96 divisors (see below), whose sum is σ = 6535296. Its totient is φ = 449280.

The previous prime is 2164859. The next prime is 2164901. The reversal of 2164890 is 984612.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35460 + ... + 35520.

It is an arithmetic number, because the mean of its divisors is an integer number (68076).

2^2164890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2164890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3267648).

2164890 is an abundant number, since it is smaller than the sum of its proper divisors (4370406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2164890 is a wasteful number, since it uses less digits than its factorization.

2164890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 2164890 is about 1471.3565169598. The cubic root of 2164890 is about 129.3635558969.

The spelling of 2164890 in words is "two million, one hundred sixty-four thousand, eight hundred ninety".