1628845 has 4 divisors (see below), whose sum is σ = 1954620. Its totient is φ = 1303072.

The previous prime is 1628839. The next prime is 1628857. The reversal of 1628845 is 5488261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5488261 = 1583 ⋅3467.

It can be written as a sum of positive squares in 2 ways, for example, as 184041 + 1444804 = 429^2 + 1202^2 .

It is a cyclic number.

It is not a de Polignac number, because 1628845 - 2¹⁹ = 1104557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1628845.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162880 + ... + 162889.

It is an arithmetic number, because the mean of its divisors is an integer number (488655).

2^1628845 is an apocalyptic number.

It is an amenable number.

1628845 is a deficient number, since it is larger than the sum of its proper divisors (325775).

1628845 is an equidigital number, since it uses as much as digits as its factorization.

1628845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325774.

The product of its digits is 15360, while the sum is 34.

The square root of 1628845 is about 1276.2621204126. The cubic root of 1628845 is about 117.6593883402.

The spelling of 1628845 in words is "one million, six hundred twenty-eight thousand, eight hundred forty-five".