38221709 has 2 divisors, whose sum is σ = 38221710. Its totient is φ = 38221708.

The previous prime is 38221679. The next prime is 38221721. The reversal of 38221709 is 90712283.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37576900 + 644809 = 6130^2 + 803^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38221709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38221759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19110854 + 19110855.

It is an arithmetic number, because the mean of its divisors is an integer number (19110855).

Almost surely, 2^38221709 is an apocalyptic number.

It is an amenable number.

38221709 is a deficient number, since it is larger than the sum of its proper divisors (1).

38221709 is an equidigital number, since it uses as much as digits as its factorization.

38221709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 38221709 is about 6182.3708235595. The cubic root of 38221709 is about 336.8501154684.

The spelling of 38221709 in words is "thirty-eight million, two hundred twenty-one thousand, seven hundred nine".