2157812 has 12 divisors (see below), whose sum is σ = 3786720. Its totient is φ = 1075896.

The previous prime is 2157797. The next prime is 2157821. The reversal of 2157812 is 2187512.

2157812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1889 + ... + 2807.

It is an arithmetic number, because the mean of its divisors is an integer number (315560).

2^2157812 is an apocalyptic number.

It is an amenable number.

2157812 is a deficient number, since it is larger than the sum of its proper divisors (1628908).

2157812 is a wasteful number, since it uses less digits than its factorization.

2157812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510 (or 1508 counting only the distinct ones).

The product of its digits is 1120, while the sum is 26.

The square root of 2157812 is about 1468.9492843526. The cubic root of 2157812 is about 129.2224194050. Note that the first 3 decimals are identical.

The spelling of 2157812 in words is "two million, one hundred fifty-seven thousand, eight hundred twelve".