1628217 has 12 divisors (see below), whose sum is σ = 2374164. Its totient is φ = 1075200.

The previous prime is 1628203. The next prime is 1628227. The reversal of 1628217 is 7128261.

It can be written as a sum of positive squares in 2 ways, for example, as 881721 + 746496 = 939^2 + 864^2 .

It is not a de Polignac number, because 1628217 - 2⁶ = 1628153 is a prime.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1628227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 217 + ... + 1817.

It is an arithmetic number, because the mean of its divisors is an integer number (197847).

2^1628217 is an apocalyptic number.

It is an amenable number.

1628217 is a deficient number, since it is larger than the sum of its proper divisors (745947).

1628217 is a wasteful number, since it uses less digits than its factorization.

1628217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720 (or 1717 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 1628217 is about 1276.0160657296. The cubic root of 1628217 is about 117.6442652327.

The spelling of 1628217 in words is "one million, six hundred twenty-eight thousand, two hundred seventeen".