1648993 has 4 divisors (see below), whose sum is σ = 1651860. Its totient is φ = 1646128.

The previous prime is 1648987. The next prime is 1649003. The reversal of 1648993 is 3998461.

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

It can be written as a sum of positive squares in 2 ways, for example, as 508369 + 1140624 = 713^2 + 1068^2 .

It is a cyclic number.

It is not a de Polignac number, because 1648993 - 2⁹ = 1648481 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1648943) 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, 238 + ... + 1831.

It is an arithmetic number, because the mean of its divisors is an integer number (412965).

2^1648993 is an apocalyptic number.

It is an amenable number.

1648993 is a deficient number, since it is larger than the sum of its proper divisors (2867).

1648993 is an equidigital number, since it uses as much as digits as its factorization.

1648993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2866.

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

The square root of 1648993 is about 1284.1312238241. The cubic root of 1648993 is about 118.1425310151.

The spelling of 1648993 in words is "one million, six hundred forty-eight thousand, nine hundred ninety-three".