6420449 has 8 divisors (see below), whose sum is σ = 7360320. Its totient is φ = 5486256.

The previous prime is 6420437. The next prime is 6420451. The reversal of 6420449 is 9440246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6420449 - 2¹⁶ = 6354913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6423449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1382 + ... + 3840.

It is an arithmetic number, because the mean of its divisors is an integer number (920040).

Almost surely, 2^6420449 is an apocalyptic number.

It is an amenable number.

6420449 is a deficient number, since it is larger than the sum of its proper divisors (939871).

6420449 is a wasteful number, since it uses less digits than its factorization.

6420449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2839.

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

The square root of 6420449 is about 2533.8604933974. The cubic root of 6420449 is about 185.8610844670.

It can be divided in two parts, 64 and 20449, that multiplied together give a square (1308736 = 1144²).

The spelling of 6420449 in words is "six million, four hundred twenty thousand, four hundred forty-nine".