2193671638 has 16 divisors (see below), whose sum is σ = 3465120240. Its totient is φ = 1038679200.

The previous prime is 2193671629. The next prime is 2193671639. The reversal of 2193671638 is 8361763912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2193671639) 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, 93628 + ... + 114688.

It is an arithmetic number, because the mean of its divisors is an integer number (216570015).

Almost surely, 2^2193671638 is an apocalyptic number.

2193671638 is a deficient number, since it is larger than the sum of its proper divisors (1271448602).

2193671638 is a wasteful number, since it uses less digits than its factorization.

2193671638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23823.

The product of its digits is 326592, while the sum is 46.

The square root of 2193671638 is about 46836.6484496916. The cubic root of 2193671638 is about 1299.3431865499.

The spelling of 2193671638 in words is "two billion, one hundred ninety-three million, six hundred seventy-one thousand, six hundred thirty-eight".