38117813 has 2 divisors, whose sum is σ = 38117814. Its totient is φ = 38117812.

The previous prime is 38117801. The next prime is 38117837. The reversal of 38117813 is 31871183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36024004 + 2093809 = 6002^2 + 1447^2 .

It is an emirp because it is prime and its reverse (31871183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38117813 - 2⁴ = 38117797 is a prime.

It is a super-4 number, since 4×38117813⁴ (a number of 31 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 38117813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38107813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19058906 + 19058907.

It is an arithmetic number, because the mean of its divisors is an integer number (19058907).

Almost surely, 2^38117813 is an apocalyptic number.

It is an amenable number.

38117813 is a deficient number, since it is larger than the sum of its proper divisors (1).

38117813 is an equidigital number, since it uses as much as digits as its factorization.

38117813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 32.

The square root of 38117813 is about 6173.9625039354. The cubic root of 38117813 is about 336.5446246973.

Adding to 38117813 its reverse (31871183), we get a palindrome (69988996).

The spelling of 38117813 in words is "thirty-eight million, one hundred seventeen thousand, eight hundred thirteen".