144407861 has 4 divisors (see below), whose sum is σ = 155516172. Its totient is φ = 133299552.

The previous prime is 144407839. The next prime is 144407897. The reversal of 144407861 is 168704441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 168704441 = 101 ⋅1670341.

It can be written as a sum of positive squares in 2 ways, for example, as 6345361 + 138062500 = 2519^2 + 11750^2 .

It is a cyclic number.

It is not a de Polignac number, because 144407861 - 2²⁶ = 77298997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144404861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5554136 + ... + 5554161.

It is an arithmetic number, because the mean of its divisors is an integer number (38879043).

Almost surely, 2^144407861 is an apocalyptic number.

It is an amenable number.

144407861 is a deficient number, since it is larger than the sum of its proper divisors (11108311).

144407861 is a wasteful number, since it uses less digits than its factorization.

144407861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11108310.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 144407861 is about 12016.9821918816. The cubic root of 144407861 is about 524.6426726472.

The spelling of 144407861 in words is "one hundred forty-four million, four hundred seven thousand, eight hundred sixty-one".