2173639740 has 48 divisors (see below), whose sum is σ = 6250689312. Its totient is φ = 563970816.

The previous prime is 2173639693. The next prime is 2173639757. The reversal of 2173639740 is 479363712.

It is a junction number, because it is equal to n+sod(n) for n = 2173639692 and 2173639701.

It is a congruent number.

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, 487339 + ... + 491778.

It is an arithmetic number, because the mean of its divisors is an integer number (130222694).

Almost surely, 2^2173639740 is an apocalyptic number.

2173639740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2173639740 is an abundant number, since it is smaller than the sum of its proper divisors (4077049572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2173639740 is a wasteful number, since it uses less digits than its factorization.

2173639740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979166 (or 979164 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 42.

The square root of 2173639740 is about 46622.3094666062. The cubic root of 2173639740 is about 1295.3760261226.

The spelling of 2173639740 in words is "two billion, one hundred seventy-three million, six hundred thirty-nine thousand, seven hundred forty".