144438581 has 8 divisors (see below), whose sum is σ = 165232704. Its totient is φ = 123684480.

The previous prime is 144438577. The next prime is 144438599. The reversal of 144438581 is 185834441.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 144438581 - 2² = 144438577 is a prime.

It is a super-2 number, since 2×144438581² = 41725007362587122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144438571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1820 + ... + 17093.

It is an arithmetic number, because the mean of its divisors is an integer number (20654088).

Almost surely, 2^144438581 is an apocalyptic number.

It is an amenable number.

144438581 is a deficient number, since it is larger than the sum of its proper divisors (20794123).

144438581 is a wasteful number, since it uses less digits than its factorization.

144438581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20011.

The product of its digits is 61440, while the sum is 38.

The square root of 144438581 is about 12018.2603150373. The cubic root of 144438581 is about 524.6798725615.

The spelling of 144438581 in words is "one hundred forty-four million, four hundred thirty-eight thousand, five hundred eighty-one".