38128913 has 2 divisors, whose sum is σ = 38128914. Its totient is φ = 38128912.

The previous prime is 38128903. The next prime is 38128919. The reversal of 38128913 is 31982183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22391824 + 15737089 = 4732^2 + 3967^2 .

It is an emirp because it is prime and its reverse (31982183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38128913 - 2⁴ = 38128897 is a prime.

It is not a weakly prime, because it can be changed into another prime (38128919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19064456 + 19064457.

It is an arithmetic number, because the mean of its divisors is an integer number (19064457).

Almost surely, 2^38128913 is an apocalyptic number.

It is an amenable number.

38128913 is a deficient number, since it is larger than the sum of its proper divisors (1).

38128913 is an equidigital number, since it uses as much as digits as its factorization.

38128913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 35.

The square root of 38128913 is about 6174.8613749622. The cubic root of 38128913 is about 336.5772890650.

The spelling of 38128913 in words is "thirty-eight million, one hundred twenty-eight thousand, nine hundred thirteen".