1451220 has 72 divisors (see below), whose sum is σ = 4352544. Its totient is φ = 361152.

The previous prime is 1451213. The next prime is 1451237. The reversal of 1451220 is 221541.

1451220 = T₇₅ + T₇₆ + ... + T₂₀₈.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1451220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21627 + ... + 21693.

It is an arithmetic number, because the mean of its divisors is an integer number (60452).

2^1451220 is an apocalyptic number.

1451220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1451220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2176272).

1451220 is an abundant number, since it is smaller than the sum of its proper divisors (2901324).

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

1451220 is a wasteful number, since it uses less digits than its factorization.

1451220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 1451220 is about 1204.6659287952. The cubic root of 1451220 is about 113.2168545702.

Adding to 1451220 its reverse (221541), we get a palindrome (1672761).

The spelling of 1451220 in words is "one million, four hundred fifty-one thousand, two hundred twenty".