38987999 has 2 divisors, whose sum is σ = 38988000. Its totient is φ = 38987998.

The previous prime is 38987989. The next prime is 38988011. The reversal of 38987999 is 99978983.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 38987999 - 2⁴ = 38987983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38987929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19493999 + 19494000.

It is an arithmetic number, because the mean of its divisors is an integer number (19494000).

Almost surely, 2^38987999 is an apocalyptic number.

38987999 is a deficient number, since it is larger than the sum of its proper divisors (1).

38987999 is an equidigital number, since it uses as much as digits as its factorization.

38987999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8817984, while the sum is 62.

The square root of 38987999 is about 6244.0370754825. The cubic root of 38987999 is about 339.0863561786.

It can be divided in two parts, 389 and 87999, that added together give a palindrome (88388).

The spelling of 38987999 in words is "thirty-eight million, nine hundred eighty-seven thousand, nine hundred ninety-nine".