1982138 has 4 divisors (see below), whose sum is σ = 2973210. Its totient is φ = 991068.

The previous prime is 1982129. The next prime is 1982153. The reversal of 1982138 is 8312891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1247689 + 734449 = 1117^2 + 857^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495533 + ... + 495536.

2^1982138 is an apocalyptic number.

1982138 is a deficient number, since it is larger than the sum of its proper divisors (991072).

1982138 is an equidigital number, since it uses as much as digits as its factorization.

1982138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991071.

The product of its digits is 3456, while the sum is 32.

The square root of 1982138 is about 1407.8842281949. The cubic root of 1982138 is about 125.6159043108.

It can be divided in two parts, 198 and 2138, that multiplied together give a palindrome (423324).

The spelling of 1982138 in words is "one million, nine hundred eighty-two thousand, one hundred thirty-eight".