2180923538 has 4 divisors (see below), whose sum is σ = 3271385310. Its totient is φ = 1090461768.

The previous prime is 2180923519. The next prime is 2180923559. The reversal of 2180923538 is 8353290812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1990676689 + 190246849 = 44617^2 + 13793^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2180923495 and 2180923504.

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 as a sum of consecutive naturals, namely, 545230883 + ... + 545230886.

Almost surely, 2^2180923538 is an apocalyptic number.

2180923538 is a deficient number, since it is larger than the sum of its proper divisors (1090461772).

2180923538 is a wasteful number, since it uses less digits than its factorization.

2180923538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090461771.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 2180923538 is about 46700.3590778486. The cubic root of 2180923538 is about 1296.8213342891.

The spelling of 2180923538 in words is "two billion, one hundred eighty million, nine hundred twenty-three thousand, five hundred thirty-eight".