389637709 has 2 divisors, whose sum is σ = 389637710. Its totient is φ = 389637708.

The previous prime is 389637701. The next prime is 389637761. The reversal of 389637709 is 907736983.

It is an a-pointer prime, because the next prime (389637761) can be obtained adding 389637709 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 388681225 + 956484 = 19715^2 + 978^2 .

It is an emirp because it is prime and its reverse (907736983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 389637709 - 2³ = 389637701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389637701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194818854 + 194818855.

It is an arithmetic number, because the mean of its divisors is an integer number (194818855).

Almost surely, 2^389637709 is an apocalyptic number.

It is an amenable number.

389637709 is a deficient number, since it is larger than the sum of its proper divisors (1).

389637709 is an equidigital number, since it uses as much as digits as its factorization.

389637709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1714608, while the sum is 52.

The square root of 389637709 is about 19739.2428679522. The cubic root of 389637709 is about 730.3880522683.

The spelling of 389637709 in words is "three hundred eighty-nine million, six hundred thirty-seven thousand, seven hundred nine".