2143881 has 16 divisors (see below), whose sum is σ = 3198720. Its totient is φ = 1419120.

The previous prime is 2143877. The next prime is 2143901. The reversal of 2143881 is 1883412.

2143881 = 121² + 122² + ... + 201².

It is not a de Polignac number, because 2143881 - 2² = 2143877 is a prime.

It is a super-2 number, since 2×2143881² = 9192451484322, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2143831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7171 + ... + 7463.

It is an arithmetic number, because the mean of its divisors is an integer number (199920).

2^2143881 is an apocalyptic number.

It is an amenable number.

2143881 is a deficient number, since it is larger than the sum of its proper divisors (1054839).

2143881 is a wasteful number, since it uses less digits than its factorization.

2143881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573 (or 567 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 2143881 is about 1464.1997814506. The cubic root of 2143881 is about 128.9437288377.

It can be divided in two parts, 214 and 3881, that added together give a triangular number (4095 = T₉₀).

The spelling of 2143881 in words is "two million, one hundred forty-three thousand, eight hundred eighty-one".