2157587918 has 8 divisors (see below), whose sum is σ = 3297445848. Its totient is φ = 1058439304.

The previous prime is 2157587899. The next prime is 2157587953. The reversal of 2157587918 is 8197857512.

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

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a self number, because there is not a number n which added to its sum of digits gives 2157587918.

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, 10177196 + ... + 10177407.

It is an arithmetic number, because the mean of its divisors is an integer number (412180731).

Almost surely, 2^2157587918 is an apocalyptic number.

2157587918 is a deficient number, since it is larger than the sum of its proper divisors (1139857930).

2157587918 is a wasteful number, since it uses less digits than its factorization.

2157587918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20354658.

The product of its digits is 1411200, while the sum is 53.

The square root of 2157587918 is about 46449.8430352569. The cubic root of 2157587918 is about 1292.1794613599.

The spelling of 2157587918 in words is "two billion, one hundred fifty-seven million, five hundred eighty-seven thousand, nine hundred eighteen".