1980186 has 32 divisors (see below), whose sum is σ = 4354560. Its totient is φ = 596544.

The previous prime is 1980169. The next prime is 1980191. The reversal of 1980186 is 6810891.

It is a super-2 number, since 2×1980186² = 7842273189192, which contains 22 as substring.

It is a Curzon number.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3895 + ... + 4373.

It is an arithmetic number, because the mean of its divisors is an integer number (136080).

2^1980186 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1980186, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2177280).

1980186 is an abundant number, since it is smaller than the sum of its proper divisors (2374374).

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

1980186 is a wasteful number, since it uses less digits than its factorization.

1980186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550.

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

The square root of 1980186 is about 1407.1908186170. The cubic root of 1980186 is about 125.5746554538.

The spelling of 1980186 in words is "one million, nine hundred eighty thousand, one hundred eighty-six".