1243427200 has 96 divisors (see below), whose sum is σ = 3177810000. Its totient is φ = 480184320.

The previous prime is 1243427197. The next prime is 1243427257. The reversal of 1243427200 is 27243421.

It is a happy number.

It is a super-2 number, since 2×1243427200² = 3092222403399680000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

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 11 ways as a sum of consecutive naturals, for example, 86101 + ... + 99499.

Almost surely, 2^1243427200 is an apocalyptic number.

1243427200 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 1243427200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1588905000).

1243427200 is an abundant number, since it is smaller than the sum of its proper divisors (1934382800).

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

1243427200 is a wasteful number, since it uses less digits than its factorization.

1243427200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13452 (or 13435 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 1243427200 is about 35262.2631151207. The cubic root of 1243427200 is about 1075.3259368619.

The spelling of 1243427200 in words is "one billion, two hundred forty-three million, four hundred twenty-seven thousand, two hundred".