1388397380 has 12 divisors (see below), whose sum is σ = 2915634540. Its totient is φ = 555358944.

The previous prime is 1388397377. The next prime is 1388397389. The reversal of 1388397380 is 837938831.

It can be written as a sum of positive squares in 2 ways, for example, as 1064325376 + 324072004 = 32624^2 + 18002^2 .

It is not an unprimeable number, because it can be changed into a prime (1388397389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34709915 + ... + 34709954.

It is an arithmetic number, because the mean of its divisors is an integer number (242969545).

Almost surely, 2^1388397380 is an apocalyptic number.

1388397380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1388397380 is an abundant number, since it is smaller than the sum of its proper divisors (1527237160).

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

1388397380 is a wasteful number, since it uses less digits than its factorization.

1388397380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69419878 (or 69419876 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 1388397380 is about 37261.2047577638. The cubic root of 1388397380 is about 1115.5899550437.

The spelling of 1388397380 in words is "one billion, three hundred eighty-eight million, three hundred ninety-seven thousand, three hundred eighty".