451220 has 48 divisors (see below), whose sum is σ = 1185408. Its totient is φ = 140160.

The previous prime is 451207. The next prime is 451249. The reversal of 451220 is 22154.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a nialpdrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 451195 and 451204.

It is a congruent number.

It is an unprimeable number.

451220 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 15 ways as a sum of consecutive naturals, for example, 1394 + ... + 1686.

It is an arithmetic number, because the mean of its divisors is an integer number (24696).

2⁴⁵¹²²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 451220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (592704).

451220 is an abundant number, since it is smaller than the sum of its proper divisors (734188).

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

451220 is a wasteful number, since it uses less digits than its factorization.

451220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320 (or 318 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 451220 is about 671.7291120683. The cubic root of 451220 is about 76.7001324177.

Adding to 451220 its reverse (22154), we get a palindrome (473374).

The spelling of 451220 in words is "four hundred fifty-one thousand, two hundred twenty".