143238689 has 4 divisors (see below), whose sum is σ = 156260400. Its totient is φ = 130216980.

The previous prime is 143238659. The next prime is 143238691. The reversal of 143238689 is 986832341.

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, and also an emirpimes, since its reverse is a distinct semiprime: 986832341 = 11 ⋅89712031.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143238689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (143238619) 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, 6510839 + ... + 6510860.

It is an arithmetic number, because the mean of its divisors is an integer number (39065100).

Almost surely, 2^143238689 is an apocalyptic number.

It is an amenable number.

143238689 is a deficient number, since it is larger than the sum of its proper divisors (13021711).

143238689 is a wasteful number, since it uses less digits than its factorization.

143238689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13021710.

The product of its digits is 248832, while the sum is 44.

The square root of 143238689 is about 11968.2366704540. The cubic root of 143238689 is about 523.2229428496. Note that the first 3 decimals are identical.

It can be divided in two parts, 143 and 238689, that added together give a palindrome (238832).

The spelling of 143238689 in words is "one hundred forty-three million, two hundred thirty-eight thousand, six hundred eighty-nine".