387107989 has 2 divisors, whose sum is σ = 387107990. Its totient is φ = 387107988.

The previous prime is 387107971. The next prime is 387108041. The reversal of 387107989 is 989701783.

It is an a-pointer prime, because the next prime (387108041) can be obtained adding 387107989 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., 345402225 + 41705764 = 18585^2 + 6458^2 .

It is a cyclic number.

It is not a de Polignac number, because 387107989 - 2⁹ = 387107477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387107789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193553994 + 193553995.

It is an arithmetic number, because the mean of its divisors is an integer number (193553995).

Almost surely, 2^387107989 is an apocalyptic number.

It is an amenable number.

387107989 is a deficient number, since it is larger than the sum of its proper divisors (1).

387107989 is an equidigital number, since it uses as much as digits as its factorization.

387107989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 52.

The square root of 387107989 is about 19675.0600761472. The cubic root of 387107989 is about 728.8039393145.

The spelling of 387107989 in words is "three hundred eighty-seven million, one hundred seven thousand, nine hundred eighty-nine".