144261821 has 16 divisors (see below), whose sum is σ = 163296000. Its totient is φ = 126297600.

The previous prime is 144261811. The next prime is 144261823. The reversal of 144261821 is 128162441.

It is a de Polignac number, because none of the positive numbers 2^k-144261821 is a prime.

It is a super-2 number, since 2×144261821² = 41622945996472082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144261823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33605 + ... + 37653.

It is an arithmetic number, because the mean of its divisors is an integer number (10206000).

Almost surely, 2^144261821 is an apocalyptic number.

144261821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

144261821 is a deficient number, since it is larger than the sum of its proper divisors (19034179).

144261821 is a wasteful number, since it uses less digits than its factorization.

144261821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4180.

The product of its digits is 3072, while the sum is 29.

The square root of 144261821 is about 12010.9042540518. The cubic root of 144261821 is about 524.4657555501.

The spelling of 144261821 in words is "one hundred forty-four million, two hundred sixty-one thousand, eight hundred twenty-one".