1243400220144 has 120 divisors (see below), whose sum is σ = 3550827287072. Its totient is φ = 406081382400.

The previous prime is 1243400220031. The next prime is 1243400220193. The reversal of 1243400220144 is 4410220043421.

1243400220144 is a `hidden beast` number, since 1 + 2 + 434 + 0 + 0 + 220 + 1 + 4 + 4 = 666.

It is a congruent number.

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, 1195644 + ... + 1978980.

Almost surely, 2^{1243400220144} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1243400220144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1775413643536).

1243400220144 is an abundant number, since it is smaller than the sum of its proper divisors (2307427066928).

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

1243400220144 is a wasteful number, since it uses less digits than its factorization.

1243400220144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783575 (or 783566 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 1243400220144 its reverse (4410220043421), we get a palindrome (5653620263565).

The spelling of 1243400220144 in words is "one trillion, two hundred forty-three billion, four hundred million, two hundred twenty thousand, one hundred forty-four".