1243382400 has 672 divisors, whose sum is σ = 5080417020. Its totient is φ = 298598400.

The previous prime is 1243382389. The next prime is 1243382407. The reversal of 1243382400 is 42833421.

1243382400 is a `hidden beast` number, since 1 + 243 + 382 + 40 + 0 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 34012224 + 1209370176 = 5832^2 + 34776^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1243382407) by changing a digit.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 30326380 + ... + 30326420.

Almost surely, 2^1243382400 is an apocalyptic number.

1243382400 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 1243382400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2540208510).

1243382400 is an abundant number, since it is smaller than the sum of its proper divisors (3837034620).

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

1243382400 is an equidigital number, since it uses as much as digits as its factorization.

1243382400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 1243382400 is about 35261.6278693993. The cubic root of 1243382400 is about 1075.3130222389.

The spelling of 1243382400 in words is "one billion, two hundred forty-three million, three hundred eighty-two thousand, four hundred".