1243800399744 has 128 divisors (see below), whose sum is σ = 4195358572800. Its totient is φ = 355371535872.

The previous prime is 1243800399731. The next prime is 1243800399767. The reversal of 1243800399744 is 4479930083421.

1243800399744 is a `hidden beast` number, since 1 + 243 + 8 + 0 + 0 + 399 + 7 + 4 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25682662 + ... + 25731045.

It is an arithmetic number, because the mean of its divisors is an integer number (32776238850).

Almost surely, 2^{1243800399744} is an apocalyptic number.

1243800399744 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1243800399744 is an abundant number, since it is smaller than the sum of its proper divisors (2951558173056).

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

1243800399744 is an equidigital number, since it uses as much as digits as its factorization.

1243800399744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51413737 (or 51413719 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 54.

The spelling of 1243800399744 in words is "one trillion, two hundred forty-three billion, eight hundred million, three hundred ninety-nine thousand, seven hundred forty-four".