1805218872 has 32 divisors (see below), whose sum is σ = 4587035280. Its totient is φ = 591874560.

The previous prime is 1805218853. The next prime is 1805218913. The reversal of 1805218872 is 2788125081.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 615073 + ... + 618000.

Almost surely, 2^1805218872 is an apocalyptic number.

1805218872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1805218872 is an abundant number, since it is smaller than the sum of its proper divisors (2781816408).

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

1805218872 is a wasteful number, since it uses less digits than its factorization.

1805218872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1233143 (or 1233139 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 42.

The square root of 1805218872 is about 42487.8673505743. The cubic root of 1805218872 is about 1217.6149030215.

The spelling of 1805218872 in words is "one billion, eight hundred five million, two hundred eighteen thousand, eight hundred seventy-two".