1801986 has 8 divisors (see below), whose sum is σ = 3603984. Its totient is φ = 600660.

The previous prime is 1801967. The next prime is 1801997. The reversal of 1801986 is 6891081.

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

1801986 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150160 + ... + 150171.

It is an arithmetic number, because the mean of its divisors is an integer number (450498).

2^1801986 is an apocalyptic number.

1801986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1801986 is a wasteful number, since it uses less digits than its factorization.

1801986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300336.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 1801986 is about 1342.3807209581. The cubic root of 1801986 is about 121.6887614426.

The spelling of 1801986 in words is "one million, eight hundred one thousand, nine hundred eighty-six".