2173900639 has 4 divisors (see below), whose sum is σ = 2248862760. Its totient is φ = 2098938520.

The previous prime is 2173900621. The next prime is 2173900661. The reversal of 2173900639 is 9360093712.

2173900639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2173900639 - 2¹⁷ = 2173769567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2173900609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37481017 + ... + 37481074.

It is an arithmetic number, because the mean of its divisors is an integer number (562215690).

Almost surely, 2^2173900639 is an apocalyptic number.

2173900639 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

2173900639 is a deficient number, since it is larger than the sum of its proper divisors (74962121).

2173900639 is an equidigital number, since it uses as much as digits as its factorization.

2173900639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74962120.

The product of its (nonzero) digits is 61236, while the sum is 40.

The square root of 2173900639 is about 46625.1073886163. The cubic root of 2173900639 is about 1295.4278514524.

The spelling of 2173900639 in words is "two billion, one hundred seventy-three million, nine hundred thousand, six hundred thirty-nine".