1388545280 has 72 divisors (see below), whose sum is σ = 3332472192. Its totient is φ = 554338304.

The previous prime is 1388545247. The next prime is 1388545297. The reversal of 1388545280 is 825458831.

It is a super-2 number, since 2×1388545280² = 3856115989220556800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1134749 + ... + 1135971.

It is an arithmetic number, because the mean of its divisors is an integer number (46284336).

Almost surely, 2^1388545280 is an apocalyptic number.

1388545280 is a gapful number since it is divisible by the number (10) 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 1388545280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1666236096).

1388545280 is an abundant number, since it is smaller than the sum of its proper divisors (1943926912).

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

1388545280 is an equidigital number, since it uses as much as digits as its factorization.

1388545280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2131 (or 2117 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 44.

The square root of 1388545280 is about 37263.1893428354. The cubic root of 1388545280 is about 1115.6295666367.

The spelling of 1388545280 in words is "one billion, three hundred eighty-eight million, five hundred forty-five thousand, two hundred eighty".