1388887723 has 2 divisors, whose sum is σ = 1388887724. Its totient is φ = 1388887722.

The previous prime is 1388887697. The next prime is 1388887757. The reversal of 1388887723 is 3277888831.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1388887723 is a prime.

It is not a weakly prime, because it can be changed into another prime (1388887763) 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, 694443861 + 694443862.

It is an arithmetic number, because the mean of its divisors is an integer number (694443862).

Almost surely, 2^1388887723 is an apocalyptic number.

1388887723 is a deficient number, since it is larger than the sum of its proper divisors (1).

1388887723 is an equidigital number, since it uses as much as digits as its factorization.

1388887723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3612672, while the sum is 55.

The square root of 1388887723 is about 37267.7839829524. The cubic root of 1388887723 is about 1115.7212712764.

It can be divided in two parts, 138888 and 7723, that added together give a triangular number (146611 = T₅₄₁).

The spelling of 1388887723 in words is "one billion, three hundred eighty-eight million, eight hundred eighty-seven thousand, seven hundred twenty-three".