2143904 has 48 divisors (see below), whose sum is σ = 5116608. Its totient is φ = 863232.

The previous prime is 2143901. The next prime is 2143909. The reversal of 2143904 is 4093412.

It is a super-2 number, since 2×2143904² = 9192648722432, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2143904.

It is not an unprimeable number, because it can be changed into a prime (2143901) 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, 3527 + ... + 4089.

It is an arithmetic number, because the mean of its divisors is an integer number (106596).

2^2143904 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 2143904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2558304).

2143904 is an abundant number, since it is smaller than the sum of its proper divisors (2972704).

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

2143904 is a wasteful number, since it uses less digits than its factorization.

2143904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597 (or 589 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 2143904 is about 1464.2076355490. The cubic root of 2143904 is about 128.9441899477.

The spelling of 2143904 in words is "two million, one hundred forty-three thousand, nine hundred four".