38728831 has 2 divisors, whose sum is σ = 38728832. Its totient is φ = 38728830.

The previous prime is 38728793. The next prime is 38728871. The reversal of 38728831 is 13882783.

It is an a-pointer prime, because the next prime (38728871) can be obtained adding 38728831 to its sum of digits (40).

It is a weak prime.

It is an emirp because it is prime and its reverse (13882783) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38728831 - 2²⁵ = 5174399 is a prime.

It is a super-2 number, since 2×38728831² = 2999844701253122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38728871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19364415 + 19364416.

It is an arithmetic number, because the mean of its divisors is an integer number (19364416).

Almost surely, 2^38728831 is an apocalyptic number.

38728831 is a deficient number, since it is larger than the sum of its proper divisors (1).

38728831 is an equidigital number, since it uses as much as digits as its factorization.

38728831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 40.

The square root of 38728831 is about 6223.2492317117. The cubic root of 38728831 is about 338.3333400201. Note that the first 4 decimals are identical.

The spelling of 38728831 in words is "thirty-eight million, seven hundred twenty-eight thousand, eight hundred thirty-one".