6408739 has 8 divisors (see below), whose sum is σ = 6658560. Its totient is φ = 6160896.

The previous prime is 6408713. The next prime is 6408749. The reversal of 6408739 is 9378046.

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

It is a cyclic number.

It is not a de Polignac number, because 6408739 - 2¹¹ = 6406691 is a prime.

It is an Ulam number.

It is a Duffinian number.

6408739 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6408698 and 6408707.

It is not an unprimeable number, because it can be changed into a prime (6408709) 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, 10819 + ... + 11395.

It is an arithmetic number, because the mean of its divisors is an integer number (832320).

Almost surely, 2^6408739 is an apocalyptic number.

6408739 is a deficient number, since it is larger than the sum of its proper divisors (249821).

6408739 is a wasteful number, since it uses less digits than its factorization.

6408739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 6408739 is about 2531.5487354582. The cubic root of 6408739 is about 185.7480208370.

The spelling of 6408739 in words is "six million, four hundred eight thousand, seven hundred thirty-nine".