6466421 has 4 divisors (see below), whose sum is σ = 6963852. Its totient is φ = 5968992.

The previous prime is 6466417. The next prime is 6466429. The reversal of 6466421 is 1246646.

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 2102500 + 4363921 = 1450^2 + 2089^2 .

It is a cyclic number.

It is not a de Polignac number, because 6466421 - 2² = 6466417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6466429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248696 + ... + 248721.

It is an arithmetic number, because the mean of its divisors is an integer number (1740963).

Almost surely, 2^6466421 is an apocalyptic number.

It is an amenable number.

6466421 is a deficient number, since it is larger than the sum of its proper divisors (497431).

6466421 is a wasteful number, since it uses less digits than its factorization.

6466421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497430.

The product of its digits is 6912, while the sum is 29.

The square root of 6466421 is about 2542.9158460319. The cubic root of 6466421 is about 186.3036336387.

The spelling of 6466421 in words is "six million, four hundred sixty-six thousand, four hundred twenty-one".