665374 has 4 divisors (see below), whose sum is σ = 998064. Its totient is φ = 332686.

The previous prime is 665369. The next prime is 665381. The reversal of 665374 is 473566.

665374 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 473566 = 2 ⋅236783.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166342 + ... + 166345.

It is an arithmetic number, because the mean of its divisors is an integer number (249516).

2⁶⁶⁵³⁷⁴ is an apocalyptic number.

665374 is a deficient number, since it is larger than the sum of its proper divisors (332690).

665374 is a wasteful number, since it uses less digits than its factorization.

665374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332689.

The product of its digits is 15120, while the sum is 31.

The square root of 665374 is about 815.7046033951. The cubic root of 665374 is about 87.3015475234.

The spelling of 665374 in words is "six hundred sixty-five thousand, three hundred seventy-four".