38667521 has 2 divisors, whose sum is σ = 38667522. Its totient is φ = 38667520.

The previous prime is 38667493. The next prime is 38667529. The reversal of 38667521 is 12576683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20349121 + 18318400 = 4511^2 + 4280^2 .

It is a cyclic number.

It is not a de Polignac number, because 38667521 - 2⁶ = 38667457 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (38667529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19333760 + 19333761.

It is an arithmetic number, because the mean of its divisors is an integer number (19333761).

Almost surely, 2^38667521 is an apocalyptic number.

It is an amenable number.

38667521 is a deficient number, since it is larger than the sum of its proper divisors (1).

38667521 is an equidigital number, since it uses as much as digits as its factorization.

38667521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 38667521 is about 6218.3213972904. The cubic root of 38667521 is about 338.1547119190.

The spelling of 38667521 in words is "thirty-eight million, six hundred sixty-seven thousand, five hundred twenty-one".