1648939 has 4 divisors (see below), whose sum is σ = 1720656. Its totient is φ = 1577224.

The previous prime is 1648919. The next prime is 1648943. The reversal of 1648939 is 9398461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1648939 - 2⁷ = 1648811 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1648909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35824 + ... + 35869.

It is an arithmetic number, because the mean of its divisors is an integer number (430164).

2^1648939 is an apocalyptic number.

1648939 is a deficient number, since it is larger than the sum of its proper divisors (71717).

1648939 is an equidigital number, since it uses as much as digits as its factorization.

1648939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71716.

The product of its digits is 46656, while the sum is 40.

The square root of 1648939 is about 1284.1101977634. The cubic root of 1648939 is about 118.1412413864.

The spelling of 1648939 in words is "one million, six hundred forty-eight thousand, nine hundred thirty-nine".