144220420 has 24 divisors (see below), whose sum is σ = 308579544. Its totient is φ = 56599296.

The previous prime is 144220403. The next prime is 144220429. The reversal of 144220420 is 24022441.

It can be written as a sum of positive squares in 4 ways, for example, as 5875776 + 138344644 = 2424^2 + 11762^2 .

It is not an unprimeable number, because it can be changed into a prime (144220429) 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, 66969 + ... + 69088.

It is an arithmetic number, because the mean of its divisors is an integer number (12857481).

Almost surely, 2^144220420 is an apocalyptic number.

144220420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

144220420 is an abundant number, since it is smaller than the sum of its proper divisors (164359124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

144220420 is a wasteful number, since it uses less digits than its factorization.

144220420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136119 (or 136117 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 144220420 is about 12009.1806548157. The cubic root of 144220420 is about 524.4155794558.

Adding to 144220420 its reverse (24022441), we get a palindrome (168242861).

The spelling of 144220420 in words is "one hundred forty-four million, two hundred twenty thousand, four hundred twenty".