1804993920 has 192 divisors, whose sum is σ = 6561313200. Its totient is φ = 455970816.

The previous prime is 1804993873. The next prime is 1804993973. The reversal of 1804993920 is 293994081.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 101194 + ... + 117686.

Almost surely, 2^1804993920 is an apocalyptic number.

1804993920 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 1804993920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3280656600).

1804993920 is an abundant number, since it is smaller than the sum of its proper divisors (4756319280).

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

1804993920 is a wasteful number, since it uses less digits than its factorization.

1804993920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16537 (or 16522 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 1804993920 is about 42485.2200182605. The cubic root of 1804993920 is about 1217.5643244296.

The spelling of 1804993920 in words is "one billion, eight hundred four million, nine hundred ninety-three thousand, nine hundred twenty".