6499421 has 6 divisors (see below), whose sum is σ = 6570330. Its totient is φ = 6429248.

The previous prime is 6499399. The next prime is 6499439. The reversal of 6499421 is 1249946.

6499421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 52900 + 6446521 = 230^2 + 2539^2 .

It is not a de Polignac number, because 6499421 - 2⁶ = 6499357 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 (6499721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12515 + ... + 13023.

It is an arithmetic number, because the mean of its divisors is an integer number (1095055).

Almost surely, 2^6499421 is an apocalyptic number.

It is an amenable number.

6499421 is a deficient number, since it is larger than the sum of its proper divisors (70909).

6499421 is an equidigital number, since it uses as much as digits as its factorization.

6499421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735 (or 622 counting only the distinct ones).

The product of its digits is 15552, while the sum is 35.

The square root of 6499421 is about 2549.3962030253. The cubic root of 6499421 is about 186.6200163328.

The spelling of 6499421 in words is "six million, four hundred ninety-nine thousand, four hundred twenty-one".