387769189 has 2 divisors, whose sum is σ = 387769190. Its totient is φ = 387769188.

The previous prime is 387769171. The next prime is 387769229. The reversal of 387769189 is 981967783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 340956225 + 46812964 = 18465^2 + 6842^2 .

It is a cyclic number.

It is not a de Polignac number, because 387769189 - 2²¹ = 385672037 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387769159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193884594 + 193884595.

It is an arithmetic number, because the mean of its divisors is an integer number (193884595).

Almost surely, 2^387769189 is an apocalyptic number.

It is an amenable number.

387769189 is a deficient number, since it is larger than the sum of its proper divisors (1).

387769189 is an equidigital number, since it uses as much as digits as its factorization.

387769189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 58.

The square root of 387769189 is about 19691.8559054245. The cubic root of 387769189 is about 729.2186479376.

The spelling of 387769189 in words is "three hundred eighty-seven million, seven hundred sixty-nine thousand, one hundred eighty-nine".