1388540976 has 80 divisors (see below), whose sum is σ = 3818505600. Its totient is φ = 433534464.

The previous prime is 1388540971. The next prime is 1388540999. The reversal of 1388540976 is 6790458831.

It is not an unprimeable number, because it can be changed into a prime (1388540971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72615 + ... + 89721.

It is an arithmetic number, because the mean of its divisors is an integer number (47731320).

Almost surely, 2^1388540976 is an apocalyptic number.

1388540976 is a gapful number since it is divisible by the number (16) 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 1388540976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1909252800).

1388540976 is an abundant number, since it is smaller than the sum of its proper divisors (2429964624).

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

1388540976 is a wasteful number, since it uses less digits than its factorization.

1388540976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17226 (or 17220 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 51.

The square root of 1388540976 is about 37263.1315914269. The cubic root of 1388540976 is about 1115.6284139496.

The spelling of 1388540976 in words is "one billion, three hundred eighty-eight million, five hundred forty thousand, nine hundred seventy-six".