1243023043400 has 24 divisors (see below), whose sum is σ = 2890028576370. Its totient is φ = 497209217280.

The previous prime is 1243023043373. The next prime is 1243023043421. The reversal of 1243023043400 is 43403203421.

It can be written as a sum of positive squares in 3 ways, for example, as 1000252015876 + 242771027524 = 1000126^2 + 492718^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1243023043400.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3107557409 + ... + 3107557808.

Almost surely, 2^{1243023043400} is an apocalyptic number.

1243023043400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243023043400 is an abundant number, since it is smaller than the sum of its proper divisors (1647005532970).

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

1243023043400 is a wasteful number, since it uses less digits than its factorization.

1243023043400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6215115233 (or 6215115224 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 1243023043400 its reverse (43403203421), we get a palindrome (1286426246821).

The spelling of 1243023043400 in words is "one trillion, two hundred forty-three billion, twenty-three million, forty-three thousand, four hundred".