1982638 has 12 divisors (see below), whose sum is σ = 3459672. Its totient is φ = 849660.

The previous prime is 1982633. The next prime is 1982639. The reversal of 1982638 is 8362891.

It is a junction number, because it is equal to n+sod(n) for n = 1982597 and 1982606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1982633) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10018 + ... + 10213.

It is an arithmetic number, because the mean of its divisors is an integer number (288306).

2^1982638 is an apocalyptic number.

1982638 is a deficient number, since it is larger than the sum of its proper divisors (1477034).

1982638 is a wasteful number, since it uses less digits than its factorization.

1982638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20247 (or 20240 counting only the distinct ones).

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

The square root of 1982638 is about 1408.0617884170. The cubic root of 1982638 is about 125.6264657469.

The spelling of 1982638 in words is "one million, nine hundred eighty-two thousand, six hundred thirty-eight".