38889989 has 2 divisors, whose sum is σ = 38889990. Its totient is φ = 38889988.

The previous prime is 38889971. The next prime is 38890003. The reversal of 38889989 is 98998883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26604964 + 12285025 = 5158^2 + 3505^2 .

It is a cyclic number.

It is not a de Polignac number, because 38889989 - 2²⁰ = 37841413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38889589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19444994 + 19444995.

It is an arithmetic number, because the mean of its divisors is an integer number (19444995).

Almost surely, 2^38889989 is an apocalyptic number.

It is an amenable number.

38889989 is a deficient number, since it is larger than the sum of its proper divisors (1).

38889989 is an equidigital number, since it uses as much as digits as its factorization.

38889989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8957952, while the sum is 62.

The square root of 38889989 is about 6236.1838491180. The cubic root of 38889989 is about 338.8019802860.

The spelling of 38889989 in words is "thirty-eight million, eight hundred eighty-nine thousand, nine hundred eighty-nine".