1981230 has 16 divisors (see below), whose sum is σ = 4755024. Its totient is φ = 528320.

The previous prime is 1981201. The next prime is 1981237. The reversal of 1981230 is 321891.

It is a super-3 number, since 3×1981230³ = 23330601793460601000, which contains 333 as substring.

It is an Ulam number.

It is a Curzon number.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 1981230.

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, 32991 + ... + 33050.

It is an arithmetic number, because the mean of its divisors is an integer number (297189).

2^1981230 is an apocalyptic number.

1981230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1981230 is an abundant number, since it is smaller than the sum of its proper divisors (2773794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1981230 is a wasteful number, since it uses less digits than its factorization.

1981230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66051.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1981230 is about 1407.5617215597. The cubic root of 1981230 is about 125.5967202005.

It can be divided in two parts, 1981 and 230, that added together give a triangular number (2211 = T₆₆).

The spelling of 1981230 in words is "one million, nine hundred eighty-one thousand, two hundred thirty".