243929639 has 2 divisors, whose sum is σ = 243929640. Its totient is φ = 243929638.

The previous prime is 243929629. The next prime is 243929677. The reversal of 243929639 is 936929342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243929639 - 2⁸ = 243929383 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 243929593 and 243929602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243929629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121964819 + 121964820.

It is an arithmetic number, because the mean of its divisors is an integer number (121964820).

Almost surely, 2^243929639 is an apocalyptic number.

243929639 is a deficient number, since it is larger than the sum of its proper divisors (1).

243929639 is an equidigital number, since it uses as much as digits as its factorization.

243929639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 47.

The square root of 243929639 is about 15618.2469886988. The cubic root of 243929639 is about 624.8199067246.

The spelling of 243929639 in words is "two hundred forty-three million, nine hundred twenty-nine thousand, six hundred thirty-nine".