1808986 has 8 divisors (see below), whose sum is σ = 2720340. Its totient is φ = 902208.

The previous prime is 1808981. The next prime is 1808993. The reversal of 1808986 is 6898081.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1755625 + 53361 = 1325^2 + 231^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1808981) 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, 130 + ... + 1906.

2^1808986 is an apocalyptic number.

1808986 is a deficient number, since it is larger than the sum of its proper divisors (911354).

1808986 is a wasteful number, since it uses less digits than its factorization.

1808986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2288.

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 1808986 is about 1344.9855017806. The cubic root of 1808986 is about 121.8461286860.

The spelling of 1808986 in words is "one million, eight hundred eight thousand, nine hundred eighty-six".