39721223 has 2 divisors, whose sum is σ = 39721224. Its totient is φ = 39721222.

The previous prime is 39721211. The next prime is 39721237. The reversal of 39721223 is 32212793.

It is a weak prime.

It is an emirp because it is prime and its reverse (32212793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39721223 - 2²⁴ = 22944007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39721243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19860611 + 19860612.

It is an arithmetic number, because the mean of its divisors is an integer number (19860612).

Almost surely, 2^39721223 is an apocalyptic number.

39721223 is a deficient number, since it is larger than the sum of its proper divisors (1).

39721223 is an equidigital number, since it uses as much as digits as its factorization.

39721223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 29.

The square root of 39721223 is about 6302.4775287184. The cubic root of 39721223 is about 341.1988331376.

The spelling of 39721223 in words is "thirty-nine million, seven hundred twenty-one thousand, two hundred twenty-three".