1244990000 has 100 divisors (see below), whose sum is σ = 3145880496. Its totient is φ = 476256000.

The previous prime is 1244989997. The next prime is 1244990009. The reversal of 1244990000 is 994421.

It is a tau number, because it is divible by the number of its divisors (100).

It is not an unprimeable number, because it can be changed into a prime (1244990009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 227294 + ... + 232706.

Almost surely, 2^1244990000 is an apocalyptic number.

1244990000 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 1244990000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1572940248).

1244990000 is an abundant number, since it is smaller than the sum of its proper divisors (1900890496).

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

1244990000 is an equidigital number, since it uses as much as digits as its factorization.

1244990000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5464 (or 5443 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 1244990000 is about 35284.4158234198. The cubic root of 1244990000 is about 1075.7762556293.

The spelling of 1244990000 in words is "one billion, two hundred forty-four million, nine hundred ninety thousand".