1921804452 has 72 divisors (see below), whose sum is σ = 5024527872. Its totient is φ = 618710400.

The previous prime is 1921804387. The next prime is 1921804477. The reversal of 1921804452 is 2544081291.

1921804452 is a `hidden beast` number, since 192 + 18 + 0 + 4 + 452 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 687177 + ... + 689967.

Almost surely, 2^1921804452 is an apocalyptic number.

1921804452 is a gapful number since it is divisible by the number (12) 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 1921804452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2512263936).

1921804452 is an abundant number, since it is smaller than the sum of its proper divisors (3102723420).

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

1921804452 is a wasteful number, since it uses less digits than its factorization.

1921804452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3449 (or 3444 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 1921804452 is about 43838.3901620486. The cubic root of 1921804452 is about 1243.2822451837.

The spelling of 1921804452 in words is "one billion, nine hundred twenty-one million, eight hundred four thousand, four hundred fifty-two".