1981223104 has 112 divisors (see below), whose sum is σ = 4613184576. Its totient is φ = 826675200.

The previous prime is 1981223089. The next prime is 1981223107. The reversal of 1981223104 is 4013221891.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-3 number, since 3×1981223104³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1981223107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4297434 + ... + 4297894.

It is an arithmetic number, because the mean of its divisors is an integer number (41189148).

Almost surely, 2^1981223104 is an apocalyptic number.

1981223104 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1981223104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2306592288).

1981223104 is an abundant number, since it is smaller than the sum of its proper divisors (2631961472).

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

1981223104 is a wasteful number, since it uses less digits than its factorization.

1981223104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714 (or 704 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 1981223104 is about 44510.9324099148. The cubic root of 1981223104 is about 1255.9657448026.

Adding to 1981223104 its reverse (4013221891), we get a palindrome (5994444995).

The spelling of 1981223104 in words is "one billion, nine hundred eighty-one million, two hundred twenty-three thousand, one hundred four".