6909139540 has 24 divisors (see below), whose sum is σ = 14755114080. Its totient is φ = 2716813728.

The previous prime is 6909139493. The next prime is 6909139561. The reversal of 6909139540 is 459319096.

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, 2926422 + ... + 2928781.

It is an arithmetic number, because the mean of its divisors is an integer number (614796420).

Almost surely, 2^6909139540 is an apocalyptic number.

It is an amenable number.

6909139540 is an abundant number, since it is smaller than the sum of its proper divisors (7845974540).

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

6909139540 is a wasteful number, since it uses less digits than its factorization.

6909139540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5855271 (or 5855269 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 46.

The square root of 6909139540 is about 83121.2339898777. The cubic root of 6909139540 is about 1904.6184542756.

The spelling of 6909139540 in words is "six billion, nine hundred nine million, one hundred thirty-nine thousand, five hundred forty".