1243012200 has 48 divisors (see below), whose sum is σ = 3853339680. Its totient is φ = 331469760.

The previous prime is 1243012187. The next prime is 1243012213. The reversal of 1243012200 is 22103421.

It is an interprime number because it is at equal distance from previous prime (1243012187) and next prime (1243012213).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1243012200.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1035244 + ... + 1036443.

It is an arithmetic number, because the mean of its divisors is an integer number (80277910).

Almost surely, 2^1243012200 is an apocalyptic number.

1243012200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243012200 is an abundant number, since it is smaller than the sum of its proper divisors (2610327480).

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

1243012200 is a wasteful number, since it uses less digits than its factorization.

1243012200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2071706 (or 2071697 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1243012200 is about 35256.3781463723. The cubic root of 1243012200 is about 1075.2062917605.

Adding to 1243012200 its reverse (22103421), we get a palindrome (1265115621).

The spelling of 1243012200 in words is "one billion, two hundred forty-three million, twelve thousand, two hundred".