38909989 has 2 divisors, whose sum is σ = 38909990. Its totient is φ = 38909988.

The previous prime is 38909987. The next prime is 38910017. The reversal of 38909989 is 98990983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36784225 + 2125764 = 6065^2 + 1458^2 .

It is a cyclic number.

It is not a de Polignac number, because 38909989 - 2¹ = 38909987 is a prime.

Together with 38909987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38909987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19454994 + 19454995.

It is an arithmetic number, because the mean of its divisors is an integer number (19454995).

Almost surely, 2^38909989 is an apocalyptic number.

It is an amenable number.

38909989 is a deficient number, since it is larger than the sum of its proper divisors (1).

38909989 is an equidigital number, since it uses as much as digits as its factorization.

38909989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1259712, while the sum is 55.

The square root of 38909989 is about 6237.7871877774. The cubic root of 38909989 is about 338.8600490293.

The spelling of 38909989 in words is "thirty-eight million, nine hundred nine thousand, nine hundred eighty-nine".