1981384210 has 16 divisors (see below), whose sum is σ = 3840837336. Its totient is φ = 731587968.

The previous prime is 1981384169. The next prime is 1981384219. The reversal of 1981384210 is 124831891.

It can be written as a sum of positive squares in 4 ways, for example, as 1157292361 + 824091849 = 34019^2 + 28707^2 .

It is a super-3 number, since 3×1981384210³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1981384210.

It is not an unprimeable number, because it can be changed into a prime (1981384219) 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, 7620579 + ... + 7620838.

Almost surely, 2^1981384210 is an apocalyptic number.

1981384210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1981384210 is a deficient number, since it is larger than the sum of its proper divisors (1859453126).

1981384210 is a wasteful number, since it uses less digits than its factorization.

1981384210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15241437.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 1981384210 is about 44512.7421082997. The cubic root of 1981384210 is about 1255.9997874322. Note that the first 3 decimals are identical.

The spelling of 1981384210 in words is "one billion, nine hundred eighty-one million, three hundred eighty-four thousand, two hundred ten".