1243155000 has 160 divisors (see below), whose sum is σ = 3913747200. Its totient is φ = 328944000.

The previous prime is 1243154989. The next prime is 1243155031. The reversal of 1243155000 is 5513421.

It is a super-3 number, since 3×1243155000³ (a number of 28 digits) contains 333 as substring.

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, 2684769 + ... + 2685231.

It is an arithmetic number, because the mean of its divisors is an integer number (24460920).

Almost surely, 2^1243155000 is an apocalyptic number.

1243155000 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 1243155000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1956873600).

1243155000 is an abundant number, since it is smaller than the sum of its proper divisors (2670592200).

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

1243155000 is a wasteful number, since it uses less digits than its factorization.

1243155000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671 (or 652 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 1243155000 is about 35258.4032536926. The cubic root of 1243155000 is about 1075.2474642122.

Adding to 1243155000 its reverse (5513421), we get a palindrome (1248668421).

The spelling of 1243155000 in words is "one billion, two hundred forty-three million, one hundred fifty-five thousand".