144189997 has 16 divisors (see below), whose sum is σ = 169488000. Its totient is φ = 122609760.

The previous prime is 144189977. The next prime is 144190019. The reversal of 144189997 is 799981441.

144189997 = 399² + 400² + ... + 791².

It is a de Polignac number, because none of the positive numbers 2^k-144189997 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 (144189977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43329 + ... + 46537.

It is an arithmetic number, because the mean of its divisors is an integer number (10593000).

Almost surely, 2^144189997 is an apocalyptic number.

It is an amenable number.

144189997 is a deficient number, since it is larger than the sum of its proper divisors (25298003).

144189997 is an equidigital number, since it uses as much as digits as its factorization.

144189997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3361 (or 3347 counting only the distinct ones).

The product of its digits is 653184, while the sum is 52.

The square root of 144189997 is about 12007.9139320700. The cubic root of 144189997 is about 524.3787020678.

The spelling of 144189997 in words is "one hundred forty-four million, one hundred eighty-nine thousand, nine hundred ninety-seven".