2172440639 has 8 divisors (see below), whose sum is σ = 2290141440. Its totient is φ = 2055076056.

The previous prime is 2172440623. The next prime is 2172440651. The reversal of 2172440639 is 9360442712.

2172440639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2172440639 - 2⁴ = 2172440623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172440609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70727 + ... + 96680.

It is an arithmetic number, because the mean of its divisors is an integer number (286267680).

Almost surely, 2^2172440639 is an apocalyptic number.

2172440639 is a deficient number, since it is larger than the sum of its proper divisors (117700801).

2172440639 is a wasteful number, since it uses less digits than its factorization.

2172440639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168109.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 2172440639 is about 46609.4479585416. The cubic root of 2172440639 is about 1295.1377817356.

The spelling of 2172440639 in words is "two billion, one hundred seventy-two million, four hundred forty thousand, six hundred thirty-nine".