2152172840 has 16 divisors (see below), whose sum is σ = 4842388980. Its totient is φ = 860869120.

The previous prime is 2152172839. The next prime is 2152172843. The reversal of 2152172840 is 482712512.

It can be written as a sum of positive squares in 2 ways, for example, as 2062794724 + 89378116 = 45418^2 + 9454^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2152172797 and 2152172806.

It is not an unprimeable number, because it can be changed into a prime (2152172843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26902121 + ... + 26902200.

Almost surely, 2^2152172840 is an apocalyptic number.

2152172840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2152172840 is an abundant number, since it is smaller than the sum of its proper divisors (2690216140).

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

2152172840 is a wasteful number, since it uses less digits than its factorization.

2152172840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53804332 (or 53804328 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 2152172840 is about 46391.5168969500. The cubic root of 2152172840 is about 1291.0975255937.

The spelling of 2152172840 in words is "two billion, one hundred fifty-two million, one hundred seventy-two thousand, eight hundred forty".