38530813 has 2 divisors, whose sum is σ = 38530814. Its totient is φ = 38530812.

The previous prime is 38530781. The next prime is 38530831. The reversal of 38530813 is 31803583.

Together with next prime (38530831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32684089 + 5846724 = 5717^2 + 2418^2 .

It is a cyclic number.

It is not a de Polignac number, because 38530813 - 2⁵ = 38530781 is a prime.

It is a super-3 number, since 3×38530813³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38530873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19265406 + 19265407.

It is an arithmetic number, because the mean of its divisors is an integer number (19265407).

Almost surely, 2^38530813 is an apocalyptic number.

It is an amenable number.

38530813 is a deficient number, since it is larger than the sum of its proper divisors (1).

38530813 is an equidigital number, since it uses as much as digits as its factorization.

38530813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 38530813 is about 6207.3193086871. The cubic root of 38530813 is about 337.7557289979.

The spelling of 38530813 in words is "thirty-eight million, five hundred thirty thousand, eight hundred thirteen".