667398 has 16 divisors (see below), whose sum is σ = 1367856. Its totient is φ = 216960.

The previous prime is 667379. The next prime is 667417. The reversal of 667398 is 893766.

It is an interprime number because it is at equal distance from previous prime (667379) and next prime (667417).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

667398 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1111 + ... + 1602.

It is an arithmetic number, because the mean of its divisors is an integer number (85491).

2⁶⁶⁷³⁹⁸ is an apocalyptic number.

667398 is an abundant number, since it is smaller than the sum of its proper divisors (700458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667398 is a wasteful number, since it uses less digits than its factorization.

667398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2759.

The product of its digits is 54432, while the sum is 39.

The square root of 667398 is about 816.9443065473. The cubic root of 667398 is about 87.3899787256.

The spelling of 667398 in words is "six hundred sixty-seven thousand, three hundred ninety-eight".