38390923517 has 2 divisors, whose sum is σ = 38390923518. Its totient is φ = 38390923516.

The previous prime is 38390923457. The next prime is 38390923531. The reversal of 38390923517 is 71532909383.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27150471076 + 11240452441 = 164774^2 + 106021^2 .

It is a cyclic number.

It is not a de Polignac number, because 38390923517 - 2¹⁸ = 38390661373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38390920517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19195461758 + 19195461759.

It is an arithmetic number, because the mean of its divisors is an integer number (19195461759).

Almost surely, 2^38390923517 is an apocalyptic number.

It is an amenable number.

38390923517 is a deficient number, since it is larger than the sum of its proper divisors (1).

38390923517 is an equidigital number, since it uses as much as digits as its factorization.

38390923517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1224720, while the sum is 50.

The spelling of 38390923517 in words is "thirty-eight billion, three hundred ninety million, nine hundred twenty-three thousand, five hundred seventeen".