6849721 has 4 divisors (see below), whose sum is σ = 6910452. Its totient is φ = 6788992.

The previous prime is 6849701. The next prime is 6849727. The reversal of 6849721 is 1279486.

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

It can be written as a sum of positive squares in 2 ways, for example, as 275625 + 6574096 = 525^2 + 2564^2 .

It is a cyclic number.

It is not a de Polignac number, because 6849721 - 2⁷ = 6849593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6849727) 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, 30196 + ... + 30421.

It is an arithmetic number, because the mean of its divisors is an integer number (1727613).

Almost surely, 2^6849721 is an apocalyptic number.

It is an amenable number.

6849721 is a deficient number, since it is larger than the sum of its proper divisors (60731).

6849721 is a wasteful number, since it uses less digits than its factorization.

6849721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60730.

The product of its digits is 24192, while the sum is 37.

The square root of 6849721 is about 2617.1971649075. The cubic root of 6849721 is about 189.9142826646.

The spelling of 6849721 in words is "six million, eight hundred forty-nine thousand, seven hundred twenty-one".