123187387 has 2 divisors, whose sum is σ = 123187388. Its totient is φ = 123187386.

The previous prime is 123187349. The next prime is 123187399. The reversal of 123187387 is 783781321.

It is a strong prime.

It is an emirp because it is prime and its reverse (783781321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123187387 - 2¹¹ = 123185339 is a prime.

It is not a weakly prime, because it can be changed into another prime (123187327) 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 as a sum of consecutive naturals, namely, 61593693 + 61593694.

It is an arithmetic number, because the mean of its divisors is an integer number (61593694).

Almost surely, 2^123187387 is an apocalyptic number.

123187387 is a deficient number, since it is larger than the sum of its proper divisors (1).

123187387 is an equidigital number, since it uses as much as digits as its factorization.

123187387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 40.

The square root of 123187387 is about 11098.9813496555. The cubic root of 123187387 is about 497.5714056241.

The spelling of 123187387 in words is "one hundred twenty-three million, one hundred eighty-seven thousand, three hundred eighty-seven".