1388740144631 has 16 divisors (see below), whose sum is σ = 1685966236416. Its totient is φ = 1116678877056.

The previous prime is 1388740144591. The next prime is 1388740144633. The reversal of 1388740144631 is 1364410478831.

It is not a de Polignac number, because 1388740144631 - 2⁶ = 1388740144567 is a prime.

It is a super-2 number, since 2×1388740144631² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1388740144631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388740144633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18970121 + ... + 19043186.

It is an arithmetic number, because the mean of its divisors is an integer number (105372889776).

Almost surely, 2^{1388740144631} is an apocalyptic number.

1388740144631 is a deficient number, since it is larger than the sum of its proper divisors (297226091785).

1388740144631 is a wasteful number, since it uses less digits than its factorization.

1388740144631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38013638.

The product of its (nonzero) digits is 1548288, while the sum is 50.

The spelling of 1388740144631 in words is "one trillion, three hundred eighty-eight billion, seven hundred forty million, one hundred forty-four thousand, six hundred thirty-one".