6721874 has 4 divisors (see below), whose sum is σ = 10082814. Its totient is φ = 3360936.

The previous prime is 6721867. The next prime is 6721879. The reversal of 6721874 is 4781276.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 6466849 + 255025 = 2543^2 + 505^2 .

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (6721879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1680467 + ... + 1680470.

Almost surely, 2^6721874 is an apocalyptic number.

6721874 is a deficient number, since it is larger than the sum of its proper divisors (3360940).

6721874 is a wasteful number, since it uses less digits than its factorization.

6721874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3360939.

The product of its digits is 18816, while the sum is 35.

The square root of 6721874 is about 2592.6577097642. The cubic root of 6721874 is about 188.7252991667.

The spelling of 6721874 in words is "six million, seven hundred twenty-one thousand, eight hundred seventy-four".