1243240203400 has 96 divisors (see below), whose sum is σ = 3156726081600. Its totient is φ = 452577081600.

The previous prime is 1243240203391. The next prime is 1243240203419. The reversal of 1243240203400 is 43020423421.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3182790 + ... + 3551989.

It is an arithmetic number, because the mean of its divisors is an integer number (32882563350).

Almost surely, 2^{1243240203400} is an apocalyptic number.

1243240203400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243240203400 is an abundant number, since it is smaller than the sum of its proper divisors (1913485878200).

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

1243240203400 is a wasteful number, since it uses less digits than its factorization.

1243240203400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6734879 (or 6734870 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 1243240203400 its reverse (43020423421), we get a palindrome (1286260626821).

The spelling of 1243240203400 in words is "one trillion, two hundred forty-three billion, two hundred forty million, two hundred three thousand, four hundred".