1388887 has 2 divisors, whose sum is σ = 1388888. Its totient is φ = 1388886.

The previous prime is 1388873. The next prime is 1388927. The reversal of 1388887 is 7888831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1388887 - 2¹¹ = 1386839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1388837) 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, 694443 + 694444.

It is an arithmetic number, because the mean of its divisors is an integer number (694444).

2^1388887 is an apocalyptic number.

1388887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1388887 is an equidigital number, since it uses as much as digits as its factorization.

1388887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86016, while the sum is 43.

The square root of 1388887 is about 1178.5105005896. The cubic root of 1388887 is about 111.5721077676.

Adding to 1388887 its product of digits (86016), we get a triangular number (1474903 = T₁₇₁₇).

It can be divided in two parts, 138 and 8887, that added together give a square (9025 = 95²).

The spelling of 1388887 in words is "one million, three hundred eighty-eight thousand, eight hundred eighty-seven".