2129856 has 28 divisors (see below), whose sum is σ = 5635752. Its totient is φ = 709888.

The previous prime is 2129851. The next prime is 2129861. The reversal of 2129856 is 6589212.

It is an interprime number because it is at equal distance from previous prime (2129851) and next prime (2129861).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5355 + ... + 5738.

2^2129856 is an apocalyptic number.

It is an amenable number.

2129856 is an abundant number, since it is smaller than the sum of its proper divisors (3505896).

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

2129856 is a wasteful number, since it uses less digits than its factorization.

2129856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11108 (or 11098 counting only the distinct ones).

The product of its digits is 8640, while the sum is 33.

The square root of 2129856 is about 1459.4026175117. The cubic root of 2129856 is about 128.6619355678.

The spelling of 2129856 in words is "two million, one hundred twenty-nine thousand, eight hundred fifty-six".