6740639 has 4 divisors (see below), whose sum is σ = 6807480. Its totient is φ = 6673800.

The previous prime is 6740597. The next prime is 6740647. The reversal of 6740639 is 9360476.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6740639 - 2¹⁶ = 6675103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6740599 and 6740608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6740659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33269 + ... + 33470.

It is an arithmetic number, because the mean of its divisors is an integer number (1701870).

Almost surely, 2^6740639 is an apocalyptic number.

6740639 is a deficient number, since it is larger than the sum of its proper divisors (66841).

6740639 is a wasteful number, since it uses less digits than its factorization.

6740639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66840.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 6740639 is about 2596.2740610344. The cubic root of 6740639 is about 188.9007532084.

The spelling of 6740639 in words is "six million, seven hundred forty thousand, six hundred thirty-nine".