143839987 has 4 divisors (see below), whose sum is σ = 144457560. Its totient is φ = 143222416.

The previous prime is 143839973. The next prime is 143839991. The reversal of 143839987 is 789938341.

143839987 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 an emirpimes, since its reverse is a distinct semiprime: 789938341 = 53 ⋅14904497.

It is a cyclic number.

It is not a de Polignac number, because 143839987 - 2¹⁹ = 143315699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (143839957) 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, 308437 + ... + 308902.

It is an arithmetic number, because the mean of its divisors is an integer number (36114390).

Almost surely, 2^143839987 is an apocalyptic number.

143839987 is a deficient number, since it is larger than the sum of its proper divisors (617573).

143839987 is an equidigital number, since it uses as much as digits as its factorization.

143839987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617572.

The product of its digits is 1306368, while the sum is 52.

The square root of 143839987 is about 11993.3309384841. The cubic root of 143839987 is about 523.9540621209.

The spelling of 143839987 in words is "one hundred forty-three million, eight hundred thirty-nine thousand, nine hundred eighty-seven".