1999220 has 12 divisors (see below), whose sum is σ = 4198404. Its totient is φ = 799680.

The previous prime is 1999219. The next prime is 1999223. The reversal of 1999220 is 229991.

It can be written as a sum of positive squares in 2 ways, for example, as 620944 + 1378276 = 788^2 + 1174^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999223) 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, 49961 + ... + 50000.

It is an arithmetic number, because the mean of its divisors is an integer number (349867).

2^1999220 is an apocalyptic number.

1999220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1999220 is an abundant number, since it is smaller than the sum of its proper divisors (2199184).

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

1999220 is a wasteful number, since it uses less digits than its factorization.

1999220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99970 (or 99968 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 1999220 is about 1413.9377638355. The cubic root of 1999220 is about 125.9757238861.

The spelling of 1999220 in words is "one million, nine hundred ninety-nine thousand, two hundred twenty".