2157803908 has 24 divisors (see below), whose sum is σ = 4069177560. Its totient is φ = 995285760.

The previous prime is 2157803833. The next prime is 2157803909. The reversal of 2157803908 is 8093087512.

It can be written as a sum of positive squares in 4 ways, for example, as 211935364 + 1945868544 = 14558^2 + 44112^2 .

It is a super-2 number, since 2×2157803908² = 9312235410760144928, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2157803909) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 76728 + ... + 101008.

It is an arithmetic number, because the mean of its divisors is an integer number (169549065).

Almost surely, 2^2157803908 is an apocalyptic number.

It is an amenable number.

2157803908 is a deficient number, since it is larger than the sum of its proper divisors (1911373652).

2157803908 is a wasteful number, since it uses less digits than its factorization.

2157803908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26007 (or 26005 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 2157803908 is about 46452.1679580189. The cubic root of 2157803908 is about 1292.2225787267. Note that the first 3 decimals are identical.

The spelling of 2157803908 in words is "two billion, one hundred fifty-seven million, eight hundred three thousand, nine hundred eight".