1648659 has 4 divisors (see below), whose sum is σ = 2198216. Its totient is φ = 1099104.

The previous prime is 1648613. The next prime is 1648697. The reversal of 1648659 is 9568461.

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

It is not a de Polignac number, because 1648659 - 2⁷ = 1648531 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1648259) 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, 274774 + ... + 274779.

It is an arithmetic number, because the mean of its divisors is an integer number (549554).

2^1648659 is an apocalyptic number.

1648659 is a deficient number, since it is larger than the sum of its proper divisors (549557).

1648659 is an equidigital number, since it uses as much as digits as its factorization.

1648659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549556.

The product of its digits is 51840, while the sum is 39.

The square root of 1648659 is about 1284.0011682238. The cubic root of 1648659 is about 118.1345539710.

The spelling of 1648659 in words is "one million, six hundred forty-eight thousand, six hundred fifty-nine".