2129868 has 96 divisors (see below), whose sum is σ = 6256320. Its totient is φ = 622080.

The previous prime is 2129867. The next prime is 2129887. The reversal of 2129868 is 8689212.

It is a Harshad number since it is a multiple of its sum of digits (36).

Its product of digits (13824) is a multiple of the sum of its prime divisors (96).

It is not an unprimeable number, because it can be changed into a prime (2129861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51928 + ... + 51968.

It is an arithmetic number, because the mean of its divisors is an integer number (65170).

2^2129868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2129868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3128160).

2129868 is an abundant number, since it is smaller than the sum of its proper divisors (4126452).

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

2129868 is a wasteful number, since it uses less digits than its factorization.

2129868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 96 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 2129868 is about 1459.4067287771. The cubic root of 2129868 is about 128.6621772023.

The spelling of 2129868 in words is "two million, one hundred twenty-nine thousand, eight hundred sixty-eight".