1666830 has 32 divisors (see below), whose sum is σ = 4364928. Its totient is φ = 404000.

The previous prime is 1666823. The next prime is 1666843. The reversal of 1666830 is 386661.

1666830 = T₅₄₅ + T₅₄₆ + ... + T₅₅₅.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2196 + ... + 2855.

It is an arithmetic number, because the mean of its divisors is an integer number (136404).

2^1666830 is an apocalyptic number.

1666830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1666830 is an abundant number, since it is smaller than the sum of its proper divisors (2698098).

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

1666830 is a wasteful number, since it uses less digits than its factorization.

1666830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5072.

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

The square root of 1666830 is about 1291.0577059140. The cubic root of 1666830 is about 118.5669830848.

It can be divided in two parts, 166 and 6830, that added together give a palindrome (6996).

The spelling of 1666830 in words is "one million, six hundred sixty-six thousand, eight hundred thirty".