1388683798 has 4 divisors (see below), whose sum is σ = 2083025700. Its totient is φ = 694341898.

The previous prime is 1388683697. The next prime is 1388683819. The reversal of 1388683798 is 8973868831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8973868831 = 107 ⋅83867933.

It is a congruent number.

It is an unprimeable number.

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, 347170948 + ... + 347170951.

It is an arithmetic number, because the mean of its divisors is an integer number (520756425).

Almost surely, 2^1388683798 is an apocalyptic number.

1388683798 is a deficient number, since it is larger than the sum of its proper divisors (694341902).

1388683798 is an equidigital number, since it uses as much as digits as its factorization.

1388683798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694341901.

The product of its digits is 13934592, while the sum is 61.

The square root of 1388683798 is about 37265.0479403958. The cubic root of 1388683798 is about 1115.6666629274. Note that the first 5 decimals are identical.

The spelling of 1388683798 in words is "one billion, three hundred eighty-eight million, six hundred eighty-three thousand, seven hundred ninety-eight".