2143818 has 12 divisors (see below), whose sum is σ = 4644978. Its totient is φ = 714600.

The previous prime is 2143793. The next prime is 2143829. The reversal of 2143818 is 8183412.

It can be written as a sum of positive squares in only one way, i.e., 1671849 + 471969 = 1293^2 + 687^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 2143791 and 2143800.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 59533 + ... + 59568.

2^2143818 is an apocalyptic number.

2143818 is an abundant number, since it is smaller than the sum of its proper divisors (2501160).

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

2143818 is a wasteful number, since it uses less digits than its factorization.

2143818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119109 (or 119106 counting only the distinct ones).

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

The square root of 2143818 is about 1464.1782678349. The cubic root of 2143818 is about 128.9424657803.

The spelling of 2143818 in words is "two million, one hundred forty-three thousand, eight hundred eighteen".