1804121688 has 32 divisors (see below), whose sum is σ = 4620314160. Its totient is φ = 586705920.

The previous prime is 1804121681. The next prime is 1804121689. The reversal of 1804121688 is 8861214081.

It is a super-2 number, since 2×1804121688² = 6509710130223938688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1804121681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 915745 + ... + 917712.

Almost surely, 2^1804121688 is an apocalyptic number.

It is an amenable number.

1804121688 is an abundant number, since it is smaller than the sum of its proper divisors (2816192472).

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

1804121688 is a wasteful number, since it uses less digits than its factorization.

1804121688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833507 (or 1833503 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 39.

The square root of 1804121688 is about 42474.9536550659. The cubic root of 1804121688 is about 1217.3681705508.

The spelling of 1804121688 in words is "one billion, eight hundred four million, one hundred twenty-one thousand, six hundred eighty-eight".