1243550000 has 480 divisors, whose sum is σ = 4184732160. Its totient is φ = 345600000.

The previous prime is 1243549999. The next prime is 1243550023. The reversal of 1243550000 is 553421.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 65449991 + ... + 65450009.

It is an arithmetic number, because the mean of its divisors is an integer number (8718192).

Almost surely, 2^1243550000 is an apocalyptic number.

1243550000 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 1243550000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2092366080).

1243550000 is an abundant number, since it is smaller than the sum of its proper divisors (2941182160).

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

1243550000 is a wasteful number, since it uses less digits than its factorization.

1243550000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 61 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 1243550000 is about 35264.0043103446. The cubic root of 1243550000 is about 1075.3613351756.

The spelling of 1243550000 in words is "one billion, two hundred forty-three million, five hundred fifty thousand".