145520 has 40 divisors (see below), whose sum is σ = 361584. Its totient is φ = 54272.

The previous prime is 145517. The next prime is 145531. The reversal of 145520 is 25541.

145520 = T₇₅ + T₇₆ + ... + T₁₀₈.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1307 + ... + 1413.

2¹⁴⁵⁵²⁰ is an apocalyptic number.

145520 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 145520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180792).

145520 is an abundant number, since it is smaller than the sum of its proper divisors (216064).

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

145520 is a wasteful number, since it uses less digits than its factorization.

145520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 145520 is about 381.4708376796. The cubic root of 145520 is about 52.5986053113.

The spelling of 145520 in words is "one hundred forty-five thousand, five hundred twenty".