1986220 has 24 divisors (see below), whose sum is σ = 4261824. Its totient is φ = 777216.

The previous prime is 1986217. The next prime is 1986223. The reversal of 1986220 is 226891.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1986217) and next prime (1986223).

It is not an unprimeable number, because it can be changed into a prime (1986223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117 + ... + 1996.

It is an arithmetic number, because the mean of its divisors is an integer number (177576).

2^1986220 is an apocalyptic number.

1986220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1986220 is an abundant number, since it is smaller than the sum of its proper divisors (2275604).

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

1986220 is a wasteful number, since it uses less digits than its factorization.

1986220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2169 (or 2167 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1986220 is about 1409.3331756544. Note that the first 3 decimals coincide. The cubic root of 1986220 is about 125.7020759984.

The spelling of 1986220 in words is "one million, nine hundred eighty-six thousand, two hundred twenty".