143749 has 4 divisors (see below), whose sum is σ = 147136. Its totient is φ = 140364.

The previous prime is 143743. The next prime is 143779. The reversal of 143749 is 947341.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1629 + ... + 1714.

It is an arithmetic number, because the mean of its divisors is an integer number (36784).

2¹⁴³⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

143749 is a deficient number, since it is larger than the sum of its proper divisors (3387).

143749 is an equidigital number, since it uses as much as digits as its factorization.

143749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3386.

The product of its digits is 3024, while the sum is 28.

The square root of 143749 is about 379.1424534393. The cubic root of 143749 is about 52.3843561870.

The spelling of 143749 in words is "one hundred forty-three thousand, seven hundred forty-nine".