2172373638 has 8 divisors (see below), whose sum is σ = 4344747288. Its totient is φ = 724124544.

The previous prime is 2172373603. The next prime is 2172373703. The reversal of 2172373638 is 8363732712.

It is a sphenic number, since it is the product of 3 distinct primes.

2172373638 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 2172373638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181031131 + ... + 181031142.

It is an arithmetic number, because the mean of its divisors is an integer number (543093411).

Almost surely, 2^2172373638 is an apocalyptic number.

2172373638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2172373638 is a wasteful number, since it uses less digits than its factorization.

2172373638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362062278.

The product of its digits is 254016, while the sum is 42.

The square root of 2172373638 is about 46608.7292038734. The cubic root of 2172373638 is about 1295.1244669999.

The spelling of 2172373638 in words is "two billion, one hundred seventy-two million, three hundred seventy-three thousand, six hundred thirty-eight".