38840513 has 2 divisors, whose sum is σ = 38840514. Its totient is φ = 38840512.

The previous prime is 38840447. The next prime is 38840519. The reversal of 38840513 is 31504883.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36385024 + 2455489 = 6032^2 + 1567^2 .

It is an emirp because it is prime and its reverse (31504883) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38840513 - 2¹² = 38836417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 38840513.

It is not a weakly prime, because it can be changed into another prime (38840519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19420256 + 19420257.

It is an arithmetic number, because the mean of its divisors is an integer number (19420257).

Almost surely, 2^38840513 is an apocalyptic number.

It is an amenable number.

38840513 is a deficient number, since it is larger than the sum of its proper divisors (1).

38840513 is an equidigital number, since it uses as much as digits as its factorization.

38840513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 38840513 is about 6232.2157376009. The cubic root of 38840513 is about 338.6582442355.

The spelling of 38840513 in words is "thirty-eight million, eight hundred forty thousand, five hundred thirteen".