2143406 has 4 divisors (see below), whose sum is σ = 3215112. Its totient is φ = 1071702.

The previous prime is 2143391. The next prime is 2143417. The reversal of 2143406 is 6043412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 535850 + ... + 535853.

It is an arithmetic number, because the mean of its divisors is an integer number (803778).

2^2143406 is an apocalyptic number.

2143406 is a deficient number, since it is larger than the sum of its proper divisors (1071706).

2143406 is a wasteful number, since it uses less digits than its factorization.

2143406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071705.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 2143406 is about 1464.0375678240. The cubic root of 2143406 is about 128.9342051755.

Adding to 2143406 its reverse (6043412), we get a palindrome (8186818).

The spelling of 2143406 in words is "two million, one hundred forty-three thousand, four hundred six".