144431639 has 8 divisors (see below), whose sum is σ = 158803968. Its totient is φ = 130266360.

The previous prime is 144431633. The next prime is 144431641. The reversal of 144431639 is 936134441.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144431639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 144431599 and 144431608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144431633) 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, 50297 + ... + 53090.

It is an arithmetic number, because the mean of its divisors is an integer number (19850496).

Almost surely, 2^144431639 is an apocalyptic number.

144431639 is a deficient number, since it is larger than the sum of its proper divisors (14372329).

144431639 is a wasteful number, since it uses less digits than its factorization.

144431639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103525.

The product of its digits is 31104, while the sum is 35.

The square root of 144431639 is about 12017.9715010479. The cubic root of 144431639 is about 524.6714667141.

The spelling of 144431639 in words is "one hundred forty-four million, four hundred thirty-one thousand, six hundred thirty-nine".