1648189 has 4 divisors (see below), whose sum is σ = 1663420. Its totient is φ = 1632960.

The previous prime is 1648187. The next prime is 1648217. The reversal of 1648189 is 9818461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9818461 = 199 ⋅49339.

It can be written as a sum of positive squares in 2 ways, for example, as 736164 + 912025 = 858^2 + 955^2 .

It is a cyclic number.

It is not a de Polignac number, because 1648189 - 2¹ = 1648187 is a prime.

It is a Duffinian number.

1648189 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1648181) 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 3 ways as a sum of consecutive naturals, for example, 7452 + ... + 7669.

It is an arithmetic number, because the mean of its divisors is an integer number (415855).

2^1648189 is an apocalyptic number.

It is an amenable number.

1648189 is a deficient number, since it is larger than the sum of its proper divisors (15231).

1648189 is a wasteful number, since it uses less digits than its factorization.

1648189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15230.

The product of its digits is 13824, while the sum is 37.

The square root of 1648189 is about 1283.8181335376. The cubic root of 1648189 is about 118.1233269642.

It can be divided in two parts, 16 and 48189, that added together give a triangular number (48205 = T₃₁₀).

The spelling of 1648189 in words is "one million, six hundred forty-eight thousand, one hundred eighty-nine".