2145982 has 4 divisors (see below), whose sum is σ = 3218976. Its totient is φ = 1072990.

The previous prime is 2145977. The next prime is 2145991. The reversal of 2145982 is 2895412.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 536494 + ... + 536497.

It is an arithmetic number, because the mean of its divisors is an integer number (804744).

2^2145982 is an apocalyptic number.

2145982 is a deficient number, since it is larger than the sum of its proper divisors (1072994).

2145982 is a wasteful number, since it uses less digits than its factorization.

2145982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072993.

The product of its digits is 5760, while the sum is 31.

The square root of 2145982 is about 1464.9170624988. The cubic root of 2145982 is about 128.9858366358.

The spelling of 2145982 in words is "two million, one hundred forty-five thousand, nine hundred eighty-two".