387549989 has 2 divisors, whose sum is σ = 387549990. Its totient is φ = 387549988.

The previous prime is 387549971. The next prime is 387550057. The reversal of 387549989 is 989945783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 386436964 + 1113025 = 19658^2 + 1055^2 .

It is a cyclic number.

It is not a de Polignac number, because 387549989 - 2²⁸ = 119114533 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 (387549949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193774994 + 193774995.

It is an arithmetic number, because the mean of its divisors is an integer number (193774995).

Almost surely, 2^387549989 is an apocalyptic number.

It is an amenable number.

387549989 is a deficient number, since it is larger than the sum of its proper divisors (1).

387549989 is an equidigital number, since it uses as much as digits as its factorization.

387549989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19595520, while the sum is 62.

The square root of 387549989 is about 19686.2893659521. The cubic root of 387549989 is about 729.0812166504.

The spelling of 387549989 in words is "three hundred eighty-seven million, five hundred forty-nine thousand, nine hundred eighty-nine".