451985 has 4 divisors (see below), whose sum is σ = 542388.
Its totient is φ = 361584.
The previous prime is 451967. The next prime is 451987. The reversal of 451985 is 589154.
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 53824 + 398161 = 232^2 + 631^2
It is a cyclic number.
It is not a de Polignac number, because 451985 - 26 = 451921 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (451987) 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, 45194 + ... + 45203.
It is an arithmetic number, because the mean of its divisors is an integer number (135597).
2451985 is an apocalyptic number.
It is an amenable number.
451985 is a deficient number, since it is larger than the sum of its proper divisors (90403).
451985 is an equidigital number, since it uses as much as digits as its factorization.
451985 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 90402.
The product of its digits is 7200, while the sum is 32.
The square root of 451985 is about 672.2982968891.
The cubic root of 451985 is about 76.7434538373.
The spelling of 451985 in words is "four hundred fifty-one thousand, nine hundred eighty-five".