1648409 has 6 divisors (see below), whose sum is σ = 1917594. Its totient is φ = 1412880.

The previous prime is 1648391. The next prime is 1648417. The reversal of 1648409 is 9048461.

It can be written as a sum of positive squares in only one way, i.e., 1570009 + 78400 = 1253^2 + 280^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1648409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1648429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16772 + ... + 16869.

It is an arithmetic number, because the mean of its divisors is an integer number (319599).

2^1648409 is an apocalyptic number.

It is an amenable number.

1648409 is a deficient number, since it is larger than the sum of its proper divisors (269185).

1648409 is an equidigital number, since it uses as much as digits as its factorization.

1648409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33655 (or 33648 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 1648409 is about 1283.9038125966. The cubic root of 1648409 is about 118.1285824245.

The spelling of 1648409 in words is "one million, six hundred forty-eight thousand, four hundred nine".