1388793819 has 24 divisors (see below), whose sum is σ = 2162487888. Its totient is φ = 790487040.

The previous prime is 1388793817. The next prime is 1388793823. The reversal of 1388793819 is 9183978831.

It is not a de Polignac number, because 1388793819 - 2¹ = 1388793817 is a prime.

It is a super-2 number, since 2×1388793819² = 3857496543385209522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1388793811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19399 + ... + 56159.

It is an arithmetic number, because the mean of its divisors is an integer number (90103662).

Almost surely, 2^1388793819 is an apocalyptic number.

1388793819 is a deficient number, since it is larger than the sum of its proper divisors (773694069).

1388793819 is a wasteful number, since it uses less digits than its factorization.

1388793819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37035 (or 37028 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 57.

The square root of 1388793819 is about 37266.5241067637. The cubic root of 1388793819 is about 1115.6961257229.

The spelling of 1388793819 in words is "one billion, three hundred eighty-eight million, seven hundred ninety-three thousand, eight hundred nineteen".