1387123 has 2 divisors, whose sum is σ = 1387124. Its totient is φ = 1387122.

The previous prime is 1387121. The next prime is 1387129. The reversal of 1387123 is 3217831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1387123 - 2¹ = 1387121 is a prime.

It is a super-2 number, since 2×1387123² = 3848220434258, which contains 22 as substring.

Together with 1387121, it forms a pair of twin primes.

It is equal to p₁₀₆₁₈₉ and since 1387123 and 106189 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1387121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693561 + 693562.

It is an arithmetic number, because the mean of its divisors is an integer number (693562).

2^1387123 is an apocalyptic number.

1387123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387123 is an equidigital number, since it uses as much as digits as its factorization.

1387123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 25.

The square root of 1387123 is about 1177.7618604794. The cubic root of 1387123 is about 111.5248525242.

The spelling of 1387123 in words is "one million, three hundred eighty-seven thousand, one hundred twenty-three".