2188173438 has 36 divisors (see below), whose sum is σ = 5211233664. Its totient is φ = 663082200.

The previous prime is 2188173431. The next prime is 2188173439. The reversal of 2188173438 is 8343718812.

It is a junction number, because it is equal to n+sod(n) for n = 2188173393 and 2188173402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2188173431) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 500158 + ... + 504513.

Almost surely, 2^2188173438 is an apocalyptic number.

2188173438 is an abundant number, since it is smaller than the sum of its proper divisors (3023060226).

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

2188173438 is a wasteful number, since it uses less digits than its factorization.

2188173438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004701 (or 1004687 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 2188173438 is about 46777.9161357152. The cubic root of 2188173438 is about 1298.2567240938.

The spelling of 2188173438 in words is "two billion, one hundred eighty-eight million, one hundred seventy-three thousand, four hundred thirty-eight".