1646118938 has 16 divisors (see below), whose sum is σ = 2570606280. Its totient is φ = 789612096.

The previous prime is 1646118931. The next prime is 1646118989. The reversal of 1646118938 is 8398116461.

It can be written as a sum of positive squares in 4 ways, for example, as 1048658689 + 597460249 = 32383^2 + 24443^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1646118892 and 1646118901.

It is not an unprimeable number, because it can be changed into a prime (1646118931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81281 + ... + 99492.

Almost surely, 2^1646118938 is an apocalyptic number.

1646118938 is a deficient number, since it is larger than the sum of its proper divisors (924487342).

1646118938 is a wasteful number, since it uses less digits than its factorization.

1646118938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180961.

The product of its digits is 248832, while the sum is 47.

The square root of 1646118938 is about 40572.3913271081. The cubic root of 1646118938 is about 1180.7385346076.

The spelling of 1646118938 in words is "one billion, six hundred forty-six million, one hundred eighteen thousand, nine hundred thirty-eight".