143218397 has 4 divisors (see below), whose sum is σ = 163678176. Its totient is φ = 122758620.

The previous prime is 143218393. The next prime is 143218399. The reversal of 143218397 is 793812341.

143218397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 793812341 = 7 ⋅113401763.

It is a cyclic number.

It is not a de Polignac number, because 143218397 - 2² = 143218393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 143218397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143218393) 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, 10229879 + ... + 10229892.

It is an arithmetic number, because the mean of its divisors is an integer number (40919544).

Almost surely, 2^143218397 is an apocalyptic number.

It is an amenable number.

143218397 is a deficient number, since it is larger than the sum of its proper divisors (20459779).

143218397 is an equidigital number, since it uses as much as digits as its factorization.

143218397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20459778.

The product of its digits is 36288, while the sum is 38.

The square root of 143218397 is about 11967.3888964970. The cubic root of 143218397 is about 523.1982341124.

The spelling of 143218397 in words is "one hundred forty-three million, two hundred eighteen thousand, three hundred ninety-seven".