1982225138 has 4 divisors (see below), whose sum is σ = 2973337710. Its totient is φ = 991112568.

The previous prime is 1982225129. The next prime is 1982225153. The reversal of 1982225138 is 8315222891.

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., 1453363129 + 528862009 = 38123^2 + 22997^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1982225095 and 1982225104.

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 as a sum of consecutive naturals, namely, 495556283 + ... + 495556286.

Almost surely, 2^1982225138 is an apocalyptic number.

1982225138 is a deficient number, since it is larger than the sum of its proper divisors (991112572).

1982225138 is an equidigital number, since it uses as much as digits as its factorization.

1982225138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991112571.

The product of its digits is 69120, while the sum is 41.

The square root of 1982225138 is about 44522.1870307378. The cubic root of 1982225138 is about 1256.1774504343.

The spelling of 1982225138 in words is "one billion, nine hundred eighty-two million, two hundred twenty-five thousand, one hundred thirty-eight".