1388117712 has 160 divisors (see below), whose sum is σ = 3908321280. Its totient is φ = 423216640.

The previous prime is 1388117707. The next prime is 1388117719. The reversal of 1388117712 is 2177118831.

It is a super-2 number, since 2×1388117712² = 3853741564736229888, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388117719) 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, 6114943 + ... + 6115169.

It is an arithmetic number, because the mean of its divisors is an integer number (24427008).

Almost surely, 2^1388117712 is an apocalyptic number.

1388117712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1388117712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1954160640).

1388117712 is an abundant number, since it is smaller than the sum of its proper divisors (2520203568).

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

1388117712 is a wasteful number, since it uses less digits than its factorization.

1388117712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481 (or 475 counting only the distinct ones).

The product of its digits is 18816, while the sum is 39.

The square root of 1388117712 is about 37257.4517647141. The cubic root of 1388117712 is about 1115.5150447510.

The spelling of 1388117712 in words is "one billion, three hundred eighty-eight million, one hundred seventeen thousand, seven hundred twelve".