1666170 has 120 divisors (see below), whose sum is σ = 5214132. Its totient is φ = 380160.

The previous prime is 1666151. The next prime is 1666177. The reversal of 1666170 is 716661.

It can be written as a sum of positive squares in 2 ways, for example, as 1656369 + 9801 = 1287^2 + 99^2 .

It is a super-2 number, since 2×1666170² = 5552244937800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1666177) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 98002 + ... + 98018.

2^1666170 is an apocalyptic number.

1666170 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 1666170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2607066).

1666170 is an abundant number, since it is smaller than the sum of its proper divisors (3547962).

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

1666170 is a wasteful number, since it uses less digits than its factorization.

1666170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 1666170 is about 1290.8020762301. The cubic root of 1666170 is about 118.5513317107.

It can be divided in two parts, 166 and 6170, that added together give a palindrome (6336).

The spelling of 1666170 in words is "one million, six hundred sixty-six thousand, one hundred seventy".