451966 has 4 divisors (see below), whose sum is σ = 677952. Its totient is φ = 225982.

The previous prime is 451961. The next prime is 451967. The reversal of 451966 is 669154.

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

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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (451961) by changing a digit.

451966 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112990 + ... + 112993.

It is an arithmetic number, because the mean of its divisors is an integer number (169488).

2⁴⁵¹⁹⁶⁶ is an apocalyptic number.

451966 is a deficient number, since it is larger than the sum of its proper divisors (225986).

451966 is a wasteful number, since it uses less digits than its factorization.

451966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225985.

The product of its digits is 6480, while the sum is 31.

The square root of 451966 is about 672.2841661084. The cubic root of 451966 is about 76.7423784727.

The spelling of 451966 in words is "four hundred fifty-one thousand, nine hundred sixty-six".