2157192638 has 8 divisors (see below), whose sum is σ = 3242870832. Its totient is φ = 1076235696.

The previous prime is 2157192619. The next prime is 2157192673. The reversal of 2157192638 is 8362917512.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1179170 + ... + 1180997.

It is an arithmetic number, because the mean of its divisors is an integer number (405358854).

Almost surely, 2^2157192638 is an apocalyptic number.

2157192638 is a deficient number, since it is larger than the sum of its proper divisors (1085678194).

2157192638 is a wasteful number, since it uses less digits than its factorization.

2157192638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2360626.

The product of its digits is 181440, while the sum is 44.

The square root of 2157192638 is about 46445.5879282414. The cubic root of 2157192638 is about 1292.1005454729.

The spelling of 2157192638 in words is "two billion, one hundred fifty-seven million, one hundred ninety-two thousand, six hundred thirty-eight".