1666626 has 32 divisors (see below), whose sum is σ = 3749760. Its totient is φ = 489984.

The previous prime is 1666619. The next prime is 1666627. The reversal of 1666626 is 6266661.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666627) 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, 1330 + ... + 2258.

It is an arithmetic number, because the mean of its divisors is an integer number (117180).

2^1666626 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666626, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1874880).

1666626 is an abundant number, since it is smaller than the sum of its proper divisors (2083134).

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

1666626 is a wasteful number, since it uses less digits than its factorization.

1666626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970.

The product of its digits is 15552, while the sum is 33.

The square root of 1666626 is about 1290.9786985075. The cubic root of 1666626 is about 118.5621458285.

The spelling of 1666626 in words is "one million, six hundred sixty-six thousand, six hundred twenty-six".