1866630 has 32 divisors (see below), whose sum is σ = 4587264. Its totient is φ = 485856.

The previous prime is 1866593. The next prime is 1866637. The reversal of 1866630 is 366681.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 567 + ... + 2013.

It is an arithmetic number, because the mean of its divisors is an integer number (143352).

2^1866630 is an apocalyptic number.

1866630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1866630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2293632).

1866630 is an abundant number, since it is smaller than the sum of its proper divisors (2720634).

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

1866630 is a wasteful number, since it uses less digits than its factorization.

1866630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 1866630 is about 1366.2466834360. The cubic root of 1866630 is about 123.1268438316.

The spelling of 1866630 in words is "one million, eight hundred sixty-six thousand, six hundred thirty".