1388693662944 has 96 divisors (see below), whose sum is σ = 4171120240896. Its totient is φ = 396289689600.

The previous prime is 1388693662903. The next prime is 1388693662949. The reversal of 1388693662944 is 4492663968831.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (69) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388693662949) 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 15 ways as a sum of consecutive naturals, for example, 693657 + ... + 1805144.

It is an arithmetic number, because the mean of its divisors is an integer number (43449169176).

Almost surely, 2^{1388693662944} is an apocalyptic number.

1388693662944 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1388693662944 is an abundant number, since it is smaller than the sum of its proper divisors (2782426577952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1388693662944 is a wasteful number, since it uses less digits than its factorization.

1388693662944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2499648 (or 2499640 counting only the distinct ones).

The product of its digits is 322486272, while the sum is 69.

The spelling of 1388693662944 in words is "one trillion, three hundred eighty-eight billion, six hundred ninety-three million, six hundred sixty-two thousand, nine hundred forty-four".