667449 has 6 divisors (see below), whose sum is σ = 964106. Its totient is φ = 444960.

The previous prime is 667441. The next prime is 667463. The reversal of 667449 is 944766.

It can be written as a sum of positive squares in only one way, i.e., 608400 + 59049 = 780^2 + 243^2 .

It is not a de Polignac number, because 667449 - 2³ = 667441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37072 + ... + 37089.

2⁶⁶⁷⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

667449 is a deficient number, since it is larger than the sum of its proper divisors (296657).

667449 is a wasteful number, since it uses less digits than its factorization.

667449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74167 (or 74164 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 667449 is about 816.9755198291. The cubic root of 667449 is about 87.3922046714.

The spelling of 667449 in words is "six hundred sixty-seven thousand, four hundred forty-nine".