1868660 has 24 divisors (see below), whose sum is σ = 3950856. Its totient is φ = 742400.

The previous prime is 1868641. The next prime is 1868663. The reversal of 1868660 is 668681.

It can be written as a sum of positive squares in 4 ways, for example, as 438244 + 1430416 = 662^2 + 1196^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1868660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1868663) 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, 4460 + ... + 4860.

It is an arithmetic number, because the mean of its divisors is an integer number (164619).

2^1868660 is an apocalyptic number.

1868660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1868660 is an abundant number, since it is smaller than the sum of its proper divisors (2082196).

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

1868660 is a wasteful number, since it uses less digits than its factorization.

1868660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643 (or 641 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 1868660 is about 1366.9893927899. The cubic root of 1868660 is about 123.1714620188.

The spelling of 1868660 in words is "one million, eight hundred sixty-eight thousand, six hundred sixty".