1639982 has 4 divisors (see below), whose sum is σ = 2459976. Its totient is φ = 819990.

The previous prime is 1639949. The next prime is 1639987. The reversal of 1639982 is 2899361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2899361 = 43 ⋅67427.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1639987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409994 + ... + 409997.

It is an arithmetic number, because the mean of its divisors is an integer number (614994).

2^1639982 is an apocalyptic number.

1639982 is a deficient number, since it is larger than the sum of its proper divisors (819994).

1639982 is an equidigital number, since it uses as much as digits as its factorization.

1639982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819993.

The product of its digits is 23328, while the sum is 38.

The square root of 1639982 is about 1280.6178196480. The cubic root of 1639982 is about 117.9269393562.

The spelling of 1639982 in words is "one million, six hundred thirty-nine thousand, nine hundred eighty-two".