1801982 has 16 divisors (see below), whose sum is σ = 3327072. Its totient is φ = 712800.

The previous prime is 1801967. The next prime is 1801997. The reversal of 1801982 is 2891081.

It is an interprime number because it is at equal distance from previous prime (1801967) and next prime (1801997).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4769 + ... + 5132.

It is an arithmetic number, because the mean of its divisors is an integer number (207942).

2^1801982 is an apocalyptic number.

1801982 is a deficient number, since it is larger than the sum of its proper divisors (1525090).

1801982 is a wasteful number, since it uses less digits than its factorization.

1801982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9923.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 1801982 is about 1342.3792310670. The cubic root of 1801982 is about 121.6886714020.

The spelling of 1801982 in words is "one million, eight hundred one thousand, nine hundred eighty-two".