143869749 has 4 divisors (see below), whose sum is σ = 191826336. Its totient is φ = 95913164.

The previous prime is 143869723. The next prime is 143869751. The reversal of 143869749 is 947968341.

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: 947968341 = 3 ⋅315989447.

It is a cyclic number.

It is not a de Polignac number, because 143869749 - 2⁹ = 143869237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143869769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23978289 + ... + 23978294.

It is an arithmetic number, because the mean of its divisors is an integer number (47956584).

Almost surely, 2^143869749 is an apocalyptic number.

It is an amenable number.

143869749 is a deficient number, since it is larger than the sum of its proper divisors (47956587).

143869749 is an equidigital number, since it uses as much as digits as its factorization.

143869749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47956586.

The product of its digits is 1306368, while the sum is 51.

The square root of 143869749 is about 11994.5716472077. The cubic root of 143869749 is about 523.9901968234.

The spelling of 143869749 in words is "one hundred forty-three million, eight hundred sixty-nine thousand, seven hundred forty-nine".