1388200018 has 4 divisors (see below), whose sum is σ = 2082300030. Its totient is φ = 694100008.

The previous prime is 1388200013. The next prime is 1388200019. The reversal of 1388200018 is 8100028831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1370702529 + 17497489 = 37023^2 + 4183^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1388200013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347050003 + ... + 347050006.

Almost surely, 2^1388200018 is an apocalyptic number.

1388200018 is a deficient number, since it is larger than the sum of its proper divisors (694100012).

1388200018 is an equidigital number, since it uses as much as digits as its factorization.

1388200018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694100011.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 1388200018 is about 37258.5563059011. The cubic root of 1388200018 is about 1115.5370918165.

Adding to 1388200018 its reverse (8100028831), we get a palindrome (9488228849).

The spelling of 1388200018 in words is "one billion, three hundred eighty-eight million, two hundred thousand, eighteen".