6446649 has 8 divisors (see below), whose sum is σ = 9376992. Its totient is φ = 3907040.

The previous prime is 6446633. The next prime is 6446651. The reversal of 6446649 is 9466446.

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 6446649 - 2⁴ = 6446633 is a prime.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6446659) 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, 97644 + ... + 97709.

It is an arithmetic number, because the mean of its divisors is an integer number (1172124).

Almost surely, 2^6446649 is an apocalyptic number.

It is an amenable number.

6446649 is a deficient number, since it is larger than the sum of its proper divisors (2930343).

6446649 is a wasteful number, since it uses less digits than its factorization.

6446649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195367.

The product of its digits is 124416, while the sum is 39.

The square root of 6446649 is about 2539.0252066492. The cubic root of 6446649 is about 186.1135565102.

The spelling of 6446649 in words is "six million, four hundred forty-six thousand, six hundred forty-nine".