143998 has 4 divisors (see below), whose sum is σ = 216000. Its totient is φ = 71998.

The previous prime is 143981. The next prime is 143999. The reversal of 143998 is 899341.

It is a semiprime because it is the product of two primes.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143999) by changing a digit.

143998 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35998 + ... + 36001.

It is an arithmetic number, because the mean of its divisors is an integer number (54000).

2¹⁴³⁹⁹⁸ is an apocalyptic number.

143998 is a deficient number, since it is larger than the sum of its proper divisors (72002).

143998 is an equidigital number, since it uses as much as digits as its factorization.

143998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72001.

The product of its digits is 7776, while the sum is 34.

The square root of 143998 is about 379.4706839797. The cubic root of 143998 is about 52.4145852218.

The spelling of 143998 in words is "one hundred forty-three thousand, nine hundred ninety-eight".