143989309 has 4 divisors (see below), whose sum is σ = 144509404. Its totient is φ = 143469216.

The previous prime is 143989289. The next prime is 143989319. The reversal of 143989309 is 903989341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 903989341 = 29209 ⋅30949.

It can be written as a sum of positive squares in 2 ways, for example, as 13344409 + 130644900 = 3653^2 + 11430^2 .

It is a cyclic number.

It is not a de Polignac number, because 143989309 - 2¹⁵ = 143956541 is a prime.

It is a super-2 number, since 2×143989309² = 41465842212594962, 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 (143989319) 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 3 ways as a sum of consecutive naturals, for example, 259632 + ... + 260185.

It is an arithmetic number, because the mean of its divisors is an integer number (36127351).

Almost surely, 2^143989309 is an apocalyptic number.

It is an amenable number.

143989309 is a deficient number, since it is larger than the sum of its proper divisors (520095).

143989309 is an equidigital number, since it uses as much as digits as its factorization.

143989309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520094.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 143989309 is about 11999.5545333983. The cubic root of 143989309 is about 524.1353070642.

The spelling of 143989309 in words is "one hundred forty-three million, nine hundred eighty-nine thousand, three hundred nine".