6540393399 has 8 divisors (see below), whose sum is σ = 8724868992. Its totient is φ = 4358090040.

The previous prime is 6540393383. The next prime is 6540393401. The reversal of 6540393399 is 9933930456.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6540393399 - 2⁴ = 6540393383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6540398399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 536019 + ... + 548084.

It is an arithmetic number, because the mean of its divisors is an integer number (1090608624).

Almost surely, 2^6540393399 is an apocalyptic number.

6540393399 is a deficient number, since it is larger than the sum of its proper divisors (2184475593).

6540393399 is a wasteful number, since it uses less digits than its factorization.

6540393399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086117.

The product of its (nonzero) digits is 2361960, while the sum is 51.

The square root of 6540393399 is about 80872.6987246005. The cubic root of 6540393399 is about 1870.1134649522.

The spelling of 6540393399 in words is "six billion, five hundred forty million, three hundred ninety-three thousand, three hundred ninety-nine".