1243442520400 has 60 divisors (see below), whose sum is σ = 2987555262400. Its totient is φ = 497346272640.

The previous prime is 1243442520293. The next prime is 1243442520403. The reversal of 1243442520400 is 40252443421.

It is a super-2 number, since 2×1243442520400² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243442520403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7048471 + ... + 7222729.

Almost surely, 2^{1243442520400} is an apocalyptic number.

1243442520400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243442520400 is an abundant number, since it is smaller than the sum of its proper divisors (1744112742000).

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

1243442520400 is a wasteful number, since it uses less digits than its factorization.

1243442520400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192116 (or 192105 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 31.

Adding to 1243442520400 its reverse (40252443421), we get a palindrome (1283694963821).

The spelling of 1243442520400 in words is "one trillion, two hundred forty-three billion, four hundred forty-two million, five hundred twenty thousand, four hundred".