1243105500 has 288 divisors, whose sum is σ = 4538334528. Its totient is φ = 262080000.

The previous prime is 1243105499. The next prime is 1243105511. The reversal of 1243105500 is 55013421.

It is a super-2 number, since 2×1243105500² = 3090622568260500000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

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, 954850 + ... + 956150.

It is an arithmetic number, because the mean of its divisors is an integer number (15758106).

Almost surely, 2^1243105500 is an apocalyptic number.

1243105500 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 1243105500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2269167264).

1243105500 is an abundant number, since it is smaller than the sum of its proper divisors (3295229028).

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

1243105500 is a wasteful number, since it uses less digits than its factorization.

1243105500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350 (or 1331 counting only the distinct ones).

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

The square root of 1243105500 is about 35257.7012863856. The cubic root of 1243105500 is about 1075.2331926059.

Adding to 1243105500 its reverse (55013421), we get a palindrome (1298118921).

The spelling of 1243105500 in words is "one billion, two hundred forty-three million, one hundred five thousand, five hundred".