6492721 has 4 divisors (see below), whose sum is σ = 6630912. Its totient is φ = 6354532.

The previous prime is 6492709. The next prime is 6492727. The reversal of 6492721 is 1272946.

6492721 = T₂₀₇₉ + T₂₀₈₀ + T₂₀₈₁.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1272946 = 2 ⋅636473.

It is a cyclic number.

It is not a de Polignac number, because 6492721 - 2⁷ = 6492593 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6492727) 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, 69025 + ... + 69118.

It is an arithmetic number, because the mean of its divisors is an integer number (1657728).

Almost surely, 2^6492721 is an apocalyptic number.

6492721 is the 2081-st centered triangular number.

It is an amenable number.

6492721 is a deficient number, since it is larger than the sum of its proper divisors (138191).

6492721 is a wasteful number, since it uses less digits than its factorization.

6492721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138190.

The product of its digits is 6048, while the sum is 31.

The square root of 6492721 is about 2548.0818275715. The cubic root of 6492721 is about 186.5558678493. Note that the first 3 decimals are identical.

The spelling of 6492721 in words is "six million, four hundred ninety-two thousand, seven hundred twenty-one".