143653985 has 4 divisors (see below), whose sum is σ = 172384788. Its totient is φ = 114923184.

The previous prime is 143653981. The next prime is 143654011. The reversal of 143653985 is 589356341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 589356341 = 7 ⋅84193763.

It can be written as a sum of positive squares in 2 ways, for example, as 90174016 + 53479969 = 9496^2 + 7313^2 .

It is a cyclic number.

It is not a de Polignac number, because 143653985 - 2² = 143653981 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 (143653981) 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, 14365394 + ... + 14365403.

It is an arithmetic number, because the mean of its divisors is an integer number (43096197).

Almost surely, 2^143653985 is an apocalyptic number.

It is an amenable number.

143653985 is a deficient number, since it is larger than the sum of its proper divisors (28730803).

143653985 is an equidigital number, since it uses as much as digits as its factorization.

143653985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28730802.

The product of its digits is 388800, while the sum is 44.

The square root of 143653985 is about 11985.5740371498. The cubic root of 143653985 is about 523.7281199860.

The spelling of 143653985 in words is "one hundred forty-three million, six hundred fifty-three thousand, nine hundred eighty-five".