2172477939 has 16 divisors (see below), whose sum is σ = 2936932992. Its totient is φ = 1428235328.

The previous prime is 2172477893. The next prime is 2172477941. The reversal of 2172477939 is 9397742712.

It is a cyclic number.

It is not a de Polignac number, because 2172477939 - 2¹⁷ = 2172346867 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2172477891 and 2172477900.

It is not an unprimeable number, because it can be changed into a prime (2172477239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132439 + ... + 147935.

It is an arithmetic number, because the mean of its divisors is an integer number (183558312).

Almost surely, 2^2172477939 is an apocalyptic number.

2172477939 is a deficient number, since it is larger than the sum of its proper divisors (764455053).

2172477939 is a wasteful number, since it uses less digits than its factorization.

2172477939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16146.

The product of its digits is 1333584, while the sum is 51.

The square root of 2172477939 is about 46609.8480902910. The cubic root of 2172477939 is about 1295.1451940383.

The spelling of 2172477939 in words is "two billion, one hundred seventy-two million, four hundred seventy-seven thousand, nine hundred thirty-nine".