38739989 has 2 divisors, whose sum is σ = 38739990. Its totient is φ = 38739988.

The previous prime is 38739983. The next prime is 38740007. The reversal of 38739989 is 98993783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37920964 + 819025 = 6158^2 + 905^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38739989 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38739983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19369994 + 19369995.

It is an arithmetic number, because the mean of its divisors is an integer number (19369995).

Almost surely, 2^38739989 is an apocalyptic number.

It is an amenable number.

38739989 is a deficient number, since it is larger than the sum of its proper divisors (1).

38739989 is an equidigital number, since it uses as much as digits as its factorization.

38739989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 56.

The square root of 38739989 is about 6224.1456441828. The cubic root of 38739989 is about 338.3658288303.

The spelling of 38739989 in words is "thirty-eight million, seven hundred thirty-nine thousand, nine hundred eighty-nine".