1200042003440 has 160 divisors (see below), whose sum is σ = 3347740302336. Its totient is φ = 391139020800.

The previous prime is 1200042003427. The next prime is 1200042003449. The reversal of 1200042003440 is 443002400021.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200042003449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1813640 + ... + 2385240.

Almost surely, 2^{1200042003440} is an apocalyptic number.

1200042003440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1200042003440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1673870151168).

1200042003440 is an abundant number, since it is smaller than the sum of its proper divisors (2147698298896).

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

1200042003440 is a wasteful number, since it uses less digits than its factorization.

1200042003440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571807 (or 571801 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 1200042003440 its reverse (443002400021), we get a palindrome (1643044403461).

The spelling of 1200042003440 in words is "one trillion, two hundred billion, forty-two million, three thousand, four hundred forty".