145439424 has 84 divisors (see below), whose sum is σ = 448966336. Its totient is φ = 44748288.

The previous prime is 145439407. The next prime is 145439431. The reversal of 145439424 is 424934541.

145439424 is a `hidden beast` number, since 1 + 4 + 543 + 94 + 24 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2224 + ... + 17199.

Almost surely, 2^145439424 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 145439424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224483168).

145439424 is an abundant number, since it is smaller than the sum of its proper divisors (303526912).

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

145439424 is a wasteful number, since it uses less digits than its factorization.

145439424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19454 (or 19441 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 145439424 is about 12059.8268644289. The cubic root of 145439424 is about 525.8889537975. Note that the first 3 decimals are identical.

It can be divided in two parts, 145 and 439424, that added together give a square (439569 = 663²).

The spelling of 145439424 in words is "one hundred forty-five million, four hundred thirty-nine thousand, four hundred twenty-four".