1669626 has 48 divisors (see below), whose sum is σ = 4322880. Its totient is φ = 476280.

The previous prime is 1669597. The next prime is 1669627. The reversal of 1669626 is 6269661.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (1669627) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2331 + ... + 2961.

It is an arithmetic number, because the mean of its divisors is an integer number (90060).

2^1669626 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1669626, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2161440).

1669626 is an abundant number, since it is smaller than the sum of its proper divisors (2653254).

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

1669626 is a wasteful number, since it uses less digits than its factorization.

1669626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656 (or 643 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 1669626 is about 1292.1400852849. The cubic root of 1669626 is about 118.6332422100.

The spelling of 1669626 in words is "one million, six hundred sixty-nine thousand, six hundred twenty-six".