144219685 has 4 divisors (see below), whose sum is σ = 173063628. Its totient is φ = 115375744.

The previous prime is 144219631. The next prime is 144219727. The reversal of 144219685 is 586912441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 586912441 = 107 ⋅5485163.

It can be written as a sum of positive squares in 2 ways, for example, as 16597476 + 127622209 = 4074^2 + 11297^2 .

It is a cyclic number.

It is not a de Polignac number, because 144219685 - 2¹¹ = 144217637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14421964 + ... + 14421973.

It is an arithmetic number, because the mean of its divisors is an integer number (43265907).

Almost surely, 2^144219685 is an apocalyptic number.

It is an amenable number.

144219685 is a deficient number, since it is larger than the sum of its proper divisors (28843943).

144219685 is an equidigital number, since it uses as much as digits as its factorization.

144219685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28843942.

The product of its digits is 69120, while the sum is 40.

The square root of 144219685 is about 12009.1500531886. The cubic root of 144219685 is about 524.4146885831.

The spelling of 144219685 in words is "one hundred forty-four million, two hundred nineteen thousand, six hundred eighty-five".