1819800432 has 100 divisors (see below), whose sum is σ = 5341484016. Its totient is φ = 598026240.

The previous prime is 1819800427. The next prime is 1819800559. The reversal of 1819800432 is 2340089181.

It is a super-2 number, since 2×1819800432² = 6623347224614773248, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 82128 + ... + 101904.

Almost surely, 2^1819800432 is an apocalyptic number.

1819800432 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 1819800432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2670742008).

1819800432 is an abundant number, since it is smaller than the sum of its proper divisors (3521683584).

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

1819800432 is a wasteful number, since it uses less digits than its factorization.

1819800432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19868 (or 19853 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1819800432 is about 42659.1189782443. The cubic root of 1819800432 is about 1220.8845220371.

The spelling of 1819800432 in words is "one billion, eight hundred nineteen million, eight hundred thousand, four hundred thirty-two".