1806388164 has 72 divisors (see below), whose sum is σ = 5222625408. Its totient is φ = 515698560.

The previous prime is 1806388153. The next prime is 1806388201. The reversal of 1806388164 is 4618836081.

It is a happy number.

1806388164 is a `hidden beast` number, since 1 + 8 + 0 + 638 + 8 + 1 + 6 + 4 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 463504 + ... + 467384.

It is an arithmetic number, because the mean of its divisors is an integer number (72536464).

Almost surely, 2^1806388164 is an apocalyptic number.

1806388164 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1806388164 is an abundant number, since it is smaller than the sum of its proper divisors (3416237244).

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

1806388164 is a wasteful number, since it uses less digits than its factorization.

1806388164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5745 (or 5740 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 1806388164 is about 42501.6254277410. The cubic root of 1806388164 is about 1217.8777409700.

The spelling of 1806388164 in words is "one billion, eight hundred six million, three hundred eighty-eight thousand, one hundred sixty-four".