1243031312440 has 32 divisors (see below), whose sum is σ = 2828245410000. Its totient is φ = 491625865984.

The previous prime is 1243031312429. The next prime is 1243031312461. The reversal of 1243031312440 is 442131303421.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1243031312399 and 1243031312408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174579490 + ... + 174586609.

Almost surely, 2^{1243031312440} is an apocalyptic number.

1243031312440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243031312440 is an abundant number, since it is smaller than the sum of its proper divisors (1585214097560).

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

1243031312440 is a wasteful number, since it uses less digits than its factorization.

1243031312440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349166199 (or 349166195 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 1243031312440 its reverse (442131303421), we get a palindrome (1685162615861).

The spelling of 1243031312440 in words is "one trillion, two hundred forty-three billion, thirty-one million, three hundred twelve thousand, four hundred forty".