38864509 has 2 divisors, whose sum is σ = 38864510. Its totient is φ = 38864508.

The previous prime is 38864459. The next prime is 38864521. The reversal of 38864509 is 90546883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29192409 + 9672100 = 5403^2 + 3110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38864509 is a prime.

It is a super-2 number, since 2×38864509² = 3020900119622162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38864599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19432254 + 19432255.

It is an arithmetic number, because the mean of its divisors is an integer number (19432255).

Almost surely, 2^38864509 is an apocalyptic number.

It is an amenable number.

38864509 is a deficient number, since it is larger than the sum of its proper divisors (1).

38864509 is an equidigital number, since it uses as much as digits as its factorization.

38864509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 38864509 is about 6234.1405983503. The cubic root of 38864509 is about 338.7279718613.

The spelling of 38864509 in words is "thirty-eight million, eight hundred sixty-four thousand, five hundred nine".