38701721 has 2 divisors, whose sum is σ = 38701722. Its totient is φ = 38701720.

The previous prime is 38701717. The next prime is 38701777. The reversal of 38701721 is 12710783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31753225 + 6948496 = 5635^2 + 2636^2 .

It is a cyclic number.

It is not a de Polignac number, because 38701721 - 2² = 38701717 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (38709721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19350860 + 19350861.

It is an arithmetic number, because the mean of its divisors is an integer number (19350861).

Almost surely, 2^38701721 is an apocalyptic number.

It is an amenable number.

38701721 is a deficient number, since it is larger than the sum of its proper divisors (1).

38701721 is an equidigital number, since it uses as much as digits as its factorization.

38701721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 38701721 is about 6221.0707277767. The cubic root of 38701721 is about 338.2543776759.

The spelling of 38701721 in words is "thirty-eight million, seven hundred one thousand, seven hundred twenty-one".