1638982 has 4 divisors (see below), whose sum is σ = 2458476. Its totient is φ = 819490.

The previous prime is 1638977. The next prime is 1638983. The reversal of 1638982 is 2898361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2898361 = 769 ⋅3769.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409744 + ... + 409747.

It is an arithmetic number, because the mean of its divisors is an integer number (614619).

2^1638982 is an apocalyptic number.

1638982 is a deficient number, since it is larger than the sum of its proper divisors (819494).

1638982 is an equidigital number, since it uses as much as digits as its factorization.

1638982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819493.

The product of its digits is 20736, while the sum is 37.

The square root of 1638982 is about 1280.2273235641. The cubic root of 1638982 is about 117.9029653296.

It can be divided in two parts, 16389 and 82, that added together give a triangular number (16471 = T₁₈₁).

The spelling of 1638982 in words is "one million, six hundred thirty-eight thousand, nine hundred eighty-two".