1244120100 has 72 divisors (see below), whose sum is σ = 3627247008. Its totient is φ = 329222400.

The previous prime is 1244120081. The next prime is 1244120123. The reversal of 1244120100 is 10214421.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1244120100.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23472 + ... + 55128.

Almost surely, 2^1244120100 is an apocalyptic number.

1244120100 is a gapful number since it is divisible by the number (10) 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 1244120100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1813623504).

1244120100 is an abundant number, since it is smaller than the sum of its proper divisors (2383126908).

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

1244120100 is a wasteful number, since it uses less digits than its factorization.

1244120100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31805 (or 31798 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1244120100 is about 35272.0866975573. The cubic root of 1244120100 is about 1075.5256416197.

Adding to 1244120100 its reverse (10214421), we get a palindrome (1254334521).

The spelling of 1244120100 in words is "one billion, two hundred forty-four million, one hundred twenty thousand, one hundred".