39989143 has 2 divisors, whose sum is σ = 39989144. Its totient is φ = 39989142.

The previous prime is 39989141. The next prime is 39989149. The reversal of 39989143 is 34198993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39989143 - 2¹ = 39989141 is a prime.

Together with 39989141, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 39989093 and 39989102.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39989141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19994571 + 19994572.

It is an arithmetic number, because the mean of its divisors is an integer number (19994572).

Almost surely, 2^39989143 is an apocalyptic number.

39989143 is a deficient number, since it is larger than the sum of its proper divisors (1).

39989143 is an equidigital number, since it uses as much as digits as its factorization.

39989143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 46.

The square root of 39989143 is about 6323.6969408725. The cubic root of 39989143 is about 341.9642445207.

The spelling of 39989143 in words is "thirty-nine million, nine hundred eighty-nine thousand, one hundred forty-three".