667497 has 4 divisors (see below), whose sum is σ = 890000. Its totient is φ = 444996.

The previous prime is 667487. The next prime is 667501. The reversal of 667497 is 794766.

667497 = 184² + 185² + ... + 201².

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 667497 - 2⁸ = 667241 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667417) 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 3 ways as a sum of consecutive naturals, for example, 111247 + ... + 111252.

It is an arithmetic number, because the mean of its divisors is an integer number (222500).

2⁶⁶⁷⁴⁹⁷ is an apocalyptic number.

It is an amenable number.

667497 is a deficient number, since it is larger than the sum of its proper divisors (222503).

667497 is a wasteful number, since it uses less digits than its factorization.

667497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222502.

The product of its digits is 63504, while the sum is 39.

The square root of 667497 is about 817.0048959462. The cubic root of 667497 is about 87.3942995757.

The spelling of 667497 in words is "six hundred sixty-seven thousand, four hundred ninety-seven".