1868220 has 72 divisors (see below), whose sum is σ = 5778864. Its totient is φ = 488448.

The previous prime is 1868201. The next prime is 1868231. The reversal of 1868220 is 228681.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17407 + ... + 17513.

It is an arithmetic number, because the mean of its divisors is an integer number (80262).

2^1868220 is an apocalyptic number.

1868220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1868220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2889432).

1868220 is an abundant number, since it is smaller than the sum of its proper divisors (3910644).

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

1868220 is a wasteful number, since it uses less digits than its factorization.

1868220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 1868220 is about 1366.8284457093. The cubic root of 1868220 is about 123.1617938256.

The spelling of 1868220 in words is "one million, eight hundred sixty-eight thousand, two hundred twenty".