1177421783420 has 96 divisors (see below), whose sum is σ = 2557419480000. Its totient is φ = 455054745600.

The previous prime is 1177421783411. The next prime is 1177421783423. The reversal of 1177421783420 is 243871247711.

It is a happy number.

It is a super-3 number, since 3×1177421783420³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1177421783423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108482714 + ... + 108493566.

It is an arithmetic number, because the mean of its divisors is an integer number (26639786250).

Almost surely, 2^{1177421783420} is an apocalyptic number.

1177421783420 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 1177421783420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1278709740000).

1177421783420 is an abundant number, since it is smaller than the sum of its proper divisors (1379997696580).

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

1177421783420 is a wasteful number, since it uses less digits than its factorization.

1177421783420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12255 (or 12253 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 47.

The spelling of 1177421783420 in words is "one trillion, one hundred seventy-seven billion, four hundred twenty-one million, seven hundred eighty-three thousand, four hundred twenty".