1243190000 has 200 divisors, whose sum is σ = 3310902672. Its totient is φ = 449280000.

The previous prime is 1243189949. The next prime is 1243190021. The reversal of 1243190000 is 913421.

It is a tau number, because it is divible by the number of its divisors (200).

It is a super-2 number, since 2×1243190000² = 3091042752200000000, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9489935 + ... + 9490065.

Almost surely, 2^1243190000 is an apocalyptic number.

1243190000 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 1243190000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1655451336).

1243190000 is an abundant number, since it is smaller than the sum of its proper divisors (2067712672).

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

1243190000 is a wasteful number, since it uses less digits than its factorization.

1243190000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1243190000 is about 35258.8995857783. The cubic root of 1243190000 is about 1075.2575550182.

The spelling of 1243190000 in words is "one billion, two hundred forty-three million, one hundred ninety thousand".