1243920000 has 320 divisors, whose sum is σ = 4244391360. Its totient is φ = 322560000.

The previous prime is 1243919969. The next prime is 1243920019. The reversal of 1243920000 is 293421.

It is a tau number, because it is divible by the number of its divisors (320).

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 17039964 + ... + 17040036.

It is an arithmetic number, because the mean of its divisors is an integer number (13263723).

Almost surely, 2^1243920000 is an apocalyptic number.

1243920000 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 1243920000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2122195680).

1243920000 is an abundant number, since it is smaller than the sum of its proper divisors (3000471360).

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

1243920000 is an frugal number, since it uses more digits than its factorization.

1243920000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1243920000 is about 35269.2500629089. The cubic root of 1243920000 is about 1075.4679772457.

The spelling of 1243920000 in words is "one billion, two hundred forty-three million, nine hundred twenty thousand".