1388433309123 has 32 divisors (see below), whose sum is σ = 2122588413952. Its totient is φ = 790814340000.

The previous prime is 1388433309041. The next prime is 1388433309209. The reversal of 1388433309123 is 3219033348831.

It is a Cunningham number, because it is equal to 1178318²-1.

It is not a de Polignac number, because 1388433309123 - 2⁹ = 1388433308611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1388433309623) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8164068 + ... + 8332398.

It is an arithmetic number, because the mean of its divisors is an integer number (66330887936).

Almost surely, 2^{1388433309123} is an apocalyptic number.

1388433309123 is a deficient number, since it is larger than the sum of its proper divisors (734155104829).

1388433309123 is a wasteful number, since it uses less digits than its factorization.

1388433309123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169615.

The product of its (nonzero) digits is 1119744, while the sum is 48.

The spelling of 1388433309123 in words is "one trillion, three hundred eighty-eight billion, four hundred thirty-three million, three hundred nine thousand, one hundred twenty-three".