2139030640 has 40 divisors (see below), whose sum is σ = 5234999760. Its totient is φ = 810579456.

The previous prime is 2139030631. The next prime is 2139030653. The reversal of 2139030640 is 460309312.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 2139030599 and 2139030608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 702109 + ... + 705148.

It is an arithmetic number, because the mean of its divisors is an integer number (130874994).

Almost surely, 2^2139030640 is an apocalyptic number.

2139030640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2139030640 is an abundant number, since it is smaller than the sum of its proper divisors (3095969120).

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

2139030640 is a wasteful number, since it uses less digits than its factorization.

2139030640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407289 (or 1407283 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 2139030640 is about 46249.6555662850. The cubic root of 2139030640 is about 1288.4641377290.

Adding to 2139030640 its reverse (460309312), we get a palindrome (2599339952).

The spelling of 2139030640 in words is "two billion, one hundred thirty-nine million, thirty thousand, six hundred forty".