144535993 has 4 divisors (see below), whose sum is σ = 165184000. Its totient is φ = 123887988.

The previous prime is 144535987. The next prime is 144535997. The reversal of 144535993 is 399535441.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 144535993 - 2⁵ = 144535961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (144535997) 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, 10323993 + ... + 10324006.

It is an arithmetic number, because the mean of its divisors is an integer number (41296000).

Almost surely, 2^144535993 is an apocalyptic number.

It is an amenable number.

144535993 is a deficient number, since it is larger than the sum of its proper divisors (20648007).

144535993 is an equidigital number, since it uses as much as digits as its factorization.

144535993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20648006.

The product of its digits is 291600, while the sum is 43.

The square root of 144535993 is about 12022.3122983892. The cubic root of 144535993 is about 524.7977972643.

The spelling of 144535993 in words is "one hundred forty-four million, five hundred thirty-five thousand, nine hundred ninety-three".