2139540280 has 16 divisors (see below), whose sum is σ = 4813965720. Its totient is φ = 855816096.

The previous prime is 2139540259. The next prime is 2139540311. The reversal of 2139540280 is 820459312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26744214 + ... + 26744293.

Almost surely, 2^2139540280 is an apocalyptic number.

2139540280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2139540280 is an abundant number, since it is smaller than the sum of its proper divisors (2674425440).

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

2139540280 is a wasteful number, since it uses less digits than its factorization.

2139540280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53488518 (or 53488514 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 2139540280 is about 46255.1649007978. The cubic root of 2139540280 is about 1288.5664583327.

Adding to 2139540280 its reverse (820459312), we get a palindrome (2959999592).

The spelling of 2139540280 in words is "two billion, one hundred thirty-nine million, five hundred forty thousand, two hundred eighty".