1982815 has 4 divisors (see below), whose sum is σ = 2379384. Its totient is φ = 1586248.

The previous prime is 1982809. The next prime is 1982833. The reversal of 1982815 is 5182891.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1982815 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198277 + ... + 198286.

It is an arithmetic number, because the mean of its divisors is an integer number (594846).

2^1982815 is an apocalyptic number.

1982815 is a deficient number, since it is larger than the sum of its proper divisors (396569).

1982815 is an equidigital number, since it uses as much as digits as its factorization.

1982815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396568.

The product of its digits is 5760, while the sum is 34.

The square root of 1982815 is about 1408.1246393697. The cubic root of 1982815 is about 125.6302040698.

The spelling of 1982815 in words is "one million, nine hundred eighty-two thousand, eight hundred fifteen".