143409 has 8 divisors (see below), whose sum is σ = 218560. Its totient is φ = 81936.

The previous prime is 143401. The next prime is 143413. The reversal of 143409 is 904341.

143409 = T₁₇₄ + T₁₇₅ + ... + T₁₈₂.

143409 is nontrivially palindromic in base 2.

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

It is not a de Polignac number, because 143409 - 2³ = 143401 is a prime.

It is a super-2 number, since 2×143409² = 41132282562, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 6829 = 143409 / (1 + 4 + 3 + 4 + 0 + 9).

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (143401) 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, 3394 + ... + 3435.

It is an arithmetic number, because the mean of its divisors is an integer number (27320).

2¹⁴³⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

143409 is a deficient number, since it is larger than the sum of its proper divisors (75151).

143409 is an equidigital number, since it uses as much as digits as its factorization.

143409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6839.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 143409 is about 378.6938077128. The cubic root of 143409 is about 52.3430231651.

The spelling of 143409 in words is "one hundred forty-three thousand, four hundred nine".