2172400505 has 16 divisors (see below), whose sum is σ = 3011157504. Its totient is φ = 1486990080.

The previous prime is 2172400459. The next prime is 2172400519. The reversal of 2172400505 is 5050042712.

2172400505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2172400505 - 2⁶ = 2172400441 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1160777 + ... + 1162646.

It is an arithmetic number, because the mean of its divisors is an integer number (188197344).

Almost surely, 2^2172400505 is an apocalyptic number.

It is an amenable number.

2172400505 is a deficient number, since it is larger than the sum of its proper divisors (838756999).

2172400505 is a wasteful number, since it uses less digits than its factorization.

2172400505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2323456.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 2172400505 is about 46609.0174215248. The cubic root of 2172400505 is about 1295.1298061621.

The spelling of 2172400505 in words is "two billion, one hundred seventy-two million, four hundred thousand, five hundred five".