1628586 has 28 divisors (see below), whose sum is σ = 3665922. Its totient is φ = 542376.

The previous prime is 1628579. The next prime is 1628587. The reversal of 1628586 is 6858261.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1610361 + 18225 = 1269^2 + 135^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1628586.

It is not an unprimeable number, because it can be changed into a prime (1628587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 900 + ... + 2016.

2^1628586 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1628586, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1832961).

1628586 is an abundant number, since it is smaller than the sum of its proper divisors (2037336).

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

1628586 is an equidigital number, since it uses as much as digits as its factorization.

1628586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1137 (or 1122 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 1628586 is about 1276.1606481944. The cubic root of 1628586 is about 117.6531517335.

The spelling of 1628586 in words is "one million, six hundred twenty-eight thousand, five hundred eighty-six".