145549224 has 144 divisors (see below), whose sum is σ = 425131200. Its totient is φ = 46679328.

The previous prime is 145549207. The next prime is 145549237. The reversal of 145549224 is 422945541.

It is a happy number.

145549224 is a `hidden beast` number, since 14 + 554 + 92 + 2 + 4 = 666.

145549224 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2466907 + ... + 2466965.

It is an arithmetic number, because the mean of its divisors is an integer number (2952300).

Almost surely, 2^145549224 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 145549224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212565600).

145549224 is an abundant number, since it is smaller than the sum of its proper divisors (279581976).

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

145549224 is an frugal number, since it uses more digits than its factorization.

145549224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 111 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 145549224 is about 12064.3783097182. The cubic root of 145549224 is about 526.0212610739.

The spelling of 145549224 in words is "one hundred forty-five million, five hundred forty-nine thousand, two hundred twenty-four".