389616991 has 8 divisors (see below), whose sum is σ = 395022960. Its totient is φ = 384234048.

The previous prime is 389616979. The next prime is 389617003. The reversal of 389616991 is 199616983.

It is an interprime number because it is at equal distance from previous prime (389616979) and next prime (389617003).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-389616991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389616191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29820 + ... + 40846.

It is an arithmetic number, because the mean of its divisors is an integer number (49377870).

Almost surely, 2^389616991 is an apocalyptic number.

389616991 is a deficient number, since it is larger than the sum of its proper divisors (5405969).

389616991 is a wasteful number, since it uses less digits than its factorization.

389616991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11513.

The product of its digits is 629856, while the sum is 52.

The square root of 389616991 is about 19738.7180688109. The cubic root of 389616991 is about 730.3751065262.

The spelling of 389616991 in words is "three hundred eighty-nine million, six hundred sixteen thousand, nine hundred ninety-one".