1981238 has 16 divisors (see below), whose sum is σ = 3469824. Its totient is φ = 830760.

The previous prime is 1981237. The next prime is 1981247. The reversal of 1981238 is 8321891.

It is a super-3 number, since 3×1981238³ = 23330884414208319816, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 848 + ... + 2163.

It is an arithmetic number, because the mean of its divisors is an integer number (216864).

2^1981238 is an apocalyptic number.

1981238 is a deficient number, since it is larger than the sum of its proper divisors (1488586).

1981238 is a wasteful number, since it uses less digits than its factorization.

1981238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3067.

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

The square root of 1981238 is about 1407.5645633505. The cubic root of 1981238 is about 125.5968892491.

The spelling of 1981238 in words is "one million, nine hundred eighty-one thousand, two hundred thirty-eight".