1806533380 has 12 divisors (see below), whose sum is σ = 3793720140. Its totient is φ = 722613344.

The previous prime is 1806533327. The next prime is 1806533381. The reversal of 1806533380 is 833356081.

It can be written as a sum of positive squares in 2 ways, for example, as 256064004 + 1550469376 = 16002^2 + 39376^2 .

It is not an unprimeable number, because it can be changed into a prime (1806533381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45163315 + ... + 45163354.

It is an arithmetic number, because the mean of its divisors is an integer number (316143345).

Almost surely, 2^1806533380 is an apocalyptic number.

1806533380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1806533380 is an abundant number, since it is smaller than the sum of its proper divisors (1987186760).

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

1806533380 is a wasteful number, since it uses less digits than its factorization.

1806533380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90326678 (or 90326676 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 1806533380 is about 42503.3337516012. Note that the first 3 decimals coincide. The cubic root of 1806533380 is about 1217.9103752618.

The spelling of 1806533380 in words is "one billion, eight hundred six million, five hundred thirty-three thousand, three hundred eighty".