1243801856 has 72 divisors (see below), whose sum is σ = 2747037888. Its totient is φ = 557312000.

The previous prime is 1243801841. The next prime is 1243801873. The reversal of 1243801856 is 6581083421.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196826 + ... + 203046.

It is an arithmetic number, because the mean of its divisors is an integer number (38153304).

Almost surely, 2^1243801856 is an apocalyptic number.

1243801856 is a gapful number since it is divisible by the number (16) 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 1243801856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1373518944).

1243801856 is an abundant number, since it is smaller than the sum of its proper divisors (1503236032).

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

1243801856 is an equidigital number, since it uses as much as digits as its factorization.

1243801856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6319 (or 6305 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 1243801856 is about 35267.5751363770. The cubic root of 1243801856 is about 1075.4339278665.

The spelling of 1243801856 in words is "one billion, two hundred forty-three million, eight hundred one thousand, eight hundred fifty-six".