1645648 has 20 divisors (see below), whose sum is σ = 3213088. Its totient is φ = 816480.

The previous prime is 1645643. The next prime is 1645661. The reversal of 1645648 is 8465461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645643) 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, 2293 + ... + 2923.

2^1645648 is an apocalyptic number.

It is an amenable number.

1645648 is a deficient number, since it is larger than the sum of its proper divisors (1567440).

1645648 is a wasteful number, since it uses less digits than its factorization.

1645648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802 (or 796 counting only the distinct ones).

The product of its digits is 23040, while the sum is 34.

The square root of 1645648 is about 1282.8281256661. The cubic root of 1645648 is about 118.0625924746.

The spelling of 1645648 in words is "one million, six hundred forty-five thousand, six hundred forty-eight".