1388434979520 has 224 divisors, whose sum is σ = 5111051235840. Its totient is φ = 354151480320.

The previous prime is 1388434979479. The next prime is 1388434979527. The reversal of 1388434979520 is 259794348831.

1388434979520 is a `hidden beast` number, since 1 + 3 + 8 + 8 + 4 + 34 + 9 + 79 + 520 = 666.

It is not an unprimeable number, because it can be changed into a prime (1388434979527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3294726 + ... + 3692165.

Almost surely, 2^{1388434979520} is an apocalyptic number.

1388434979520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1388434979520 is an abundant number, since it is smaller than the sum of its proper divisors (3722616256320).

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

1388434979520 is a wasteful number, since it uses less digits than its factorization.

1388434979520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6986940 (or 6986924 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 63.

The spelling of 1388434979520 in words is "one trillion, three hundred eighty-eight billion, four hundred thirty-four million, nine hundred seventy-nine thousand, five hundred twenty".