145220 has 24 divisors (see below), whose sum is σ = 312984. Its totient is φ = 56576.

The previous prime is 145219. The next prime is 145253. The reversal of 145220 is 22541.

It can be written as a sum of positive squares in 4 ways, for example, as 30976 + 114244 = 176^2 + 338^2 .

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 145195 and 145204.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 992 + ... + 1128.

It is an arithmetic number, because the mean of its divisors is an integer number (13041).

2¹⁴⁵²²⁰ is an apocalyptic number.

145220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145220 is an abundant number, since it is smaller than the sum of its proper divisors (167764).

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

145220 is a wasteful number, since it uses less digits than its factorization.

145220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 197 counting only the distinct ones).

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

The square root of 145220 is about 381.0774199556. The cubic root of 145220 is about 52.5624351683.

Adding to 145220 its reverse (22541), we get a palindrome (167761).

The spelling of 145220 in words is "one hundred forty-five thousand, two hundred twenty".