1921180404 has 144 divisors (see below), whose sum is σ = 5619426624. Its totient is φ = 505697280.

The previous prime is 1921180403. The next prime is 1921180441. The reversal of 1921180404 is 4040811291.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921180403) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 317899 + ... + 323885.

It is an arithmetic number, because the mean of its divisors is an integer number (39023796).

Almost surely, 2^1921180404 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 1921180404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2809713312).

1921180404 is an abundant number, since it is smaller than the sum of its proper divisors (3698246220).

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

1921180404 is a wasteful number, since it uses less digits than its factorization.

1921180404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6046 (or 6033 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 1921180404 is about 43831.2719870186. The cubic root of 1921180404 is about 1243.1476578184.

Adding to 1921180404 its reverse (4040811291), we get a palindrome (5961991695).

The spelling of 1921180404 in words is "one billion, nine hundred twenty-one million, one hundred eighty thousand, four hundred four".