144777889 has 4 divisors (see below), whose sum is σ = 149770260. Its totient is φ = 139785520.

The previous prime is 144777887. The next prime is 144777911. The reversal of 144777889 is 988777441.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 107993664 + 36784225 = 10392^2 + 6065^2 .

It is a cyclic number.

It is not a de Polignac number, because 144777889 - 2¹ = 144777887 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (144777881) 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, 2496142 + ... + 2496199.

It is an arithmetic number, because the mean of its divisors is an integer number (37442565).

Almost surely, 2^144777889 is an apocalyptic number.

It is an amenable number.

144777889 is a deficient number, since it is larger than the sum of its proper divisors (4992371).

144777889 is an equidigital number, since it uses as much as digits as its factorization.

144777889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4992370.

The product of its digits is 3161088, while the sum is 55.

The square root of 144777889 is about 12032.3683869802. The cubic root of 144777889 is about 525.0904019683.

It can be divided in two parts, 14477 and 7889, that added together give a triangular number (22366 = T₂₁₁).

The spelling of 144777889 in words is "one hundred forty-four million, seven hundred seventy-seven thousand, eight hundred eighty-nine".