667973 has 4 divisors (see below), whose sum is σ = 671628. Its totient is φ = 664320.

The previous prime is 667963. The next prime is 667987. The reversal of 667973 is 379766.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 146689 + 521284 = 383^2 + 722^2 .

It is a cyclic number.

It is not a de Polignac number, because 667973 - 2¹⁸ = 405829 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 (667903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1538 + ... + 1923.

It is an arithmetic number, because the mean of its divisors is an integer number (167907).

2⁶⁶⁷⁹⁷³ is an apocalyptic number.

It is an amenable number.

667973 is a deficient number, since it is larger than the sum of its proper divisors (3655).

667973 is a wasteful number, since it uses less digits than its factorization.

667973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3654.

The product of its digits is 47628, while the sum is 38.

The square root of 667973 is about 817.2961519547. The cubic root of 667973 is about 87.4150686089.

The spelling of 667973 in words is "six hundred sixty-seven thousand, nine hundred seventy-three".