6459921 has 12 divisors (see below), whose sum is σ = 10048948. Its totient is φ = 3975264.

The previous prime is 6459913. The next prime is 6459923. The reversal of 6459921 is 1299546.

6459921 is a `hidden beast` number, since 64 + 599 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2359296 + 4100625 = 1536^2 + 2025^2 .

It is not a de Polignac number, because 6459921 - 2³ = 6459913 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6459923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27490 + ... + 27723.

Almost surely, 2^6459921 is an apocalyptic number.

It is an amenable number.

6459921 is a deficient number, since it is larger than the sum of its proper divisors (3589027).

6459921 is a wasteful number, since it uses less digits than its factorization.

6459921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55232 (or 55229 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 6459921 is about 2541.6374643131. The cubic root of 6459921 is about 186.2411890191.

It can be divided in two parts, 64599 and 21, that added together give a triangular number (64620 = T₃₅₉).

The spelling of 6459921 in words is "six million, four hundred fifty-nine thousand, nine hundred twenty-one".