39705223 has 2 divisors, whose sum is σ = 39705224.
Its totient is φ = 39705222.
The previous prime is 39705209. The next prime is 39705241. The reversal of 39705223 is 32250793.
It is a weak prime.
It is an emirp because it is prime and its reverse (32250793) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 39705223 - 221 = 37608071 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (39705283) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19852611 + 19852612.
It is an arithmetic number, because the mean of its divisors is an integer number (19852612).
Almost surely, 239705223 is an apocalyptic number.
39705223 is a deficient number, since it is larger than the sum of its proper divisors (1).
39705223 is an equidigital number, since it uses as much as digits as its factorization.
39705223 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 11340, while the sum is 31.
The square root of 39705223 is about 6301.2080587773.
The cubic root of 39705223 is about 341.1530145208.
The spelling of 39705223 in words is "thirty-nine million, seven hundred five thousand, two hundred twenty-three".