2172780423 has 24 divisors (see below), whose sum is σ = 3538172400. Its totient is φ = 1316834640.

The previous prime is 2172780419. The next prime is 2172780439. The reversal of 2172780423 is 3240872712.

2172780423 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 2172780423 - 2² = 2172780419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172780403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 329268 + ... + 335801.

It is an arithmetic number, because the mean of its divisors is an integer number (147423850).

Almost surely, 2^2172780423 is an apocalyptic number.

2172780423 is a deficient number, since it is larger than the sum of its proper divisors (1365391977).

2172780423 is a wasteful number, since it uses less digits than its factorization.

2172780423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665100 (or 665083 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 2172780423 is about 46613.0928280885. The cubic root of 2172780423 is about 1295.2053009038.

The spelling of 2172780423 in words is "two billion, one hundred seventy-two million, seven hundred eighty thousand, four hundred twenty-three".