1982805 has 32 divisors (see below), whose sum is σ = 3535488. Its totient is φ = 940800.

The previous prime is 1982803. The next prime is 1982809. The reversal of 1982805 is 5082891.

It is a happy number.

1982805 is an esthetic number in base 13, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 1982805 - 2¹ = 1982803 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1982803) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9967 + ... + 10163.

It is an arithmetic number, because the mean of its divisors is an integer number (110484).

2^1982805 is an apocalyptic number.

1982805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1982805 is a deficient number, since it is larger than the sum of its proper divisors (1552683).

1982805 is a wasteful number, since it uses less digits than its factorization.

1982805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 1982805 is about 1408.1210885432. The cubic root of 1982805 is about 125.6299928710.

It can be divided in two parts, 198 and 2805, that added together give a palindrome (3003).

The spelling of 1982805 in words is "one million, nine hundred eighty-two thousand, eight hundred five".