1390938648 has 64 divisors (see below), whose sum is σ = 3813264000. Its totient is φ = 419297280.

The previous prime is 1390938631. The next prime is 1390938707. The reversal of 1390938648 is 8468390931.

It is a self number, because there is not a number n which added to its sum of digits gives 1390938648.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 37303 + ... + 64601.

It is an arithmetic number, because the mean of its divisors is an integer number (59582250).

Almost surely, 2^1390938648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1390938648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1906632000).

1390938648 is an abundant number, since it is smaller than the sum of its proper divisors (2422325352).

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

1390938648 is a wasteful number, since it uses less digits than its factorization.

1390938648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27512 (or 27508 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 51.

The square root of 1390938648 is about 37295.2898902797. The cubic root of 1390938648 is about 1116.2701841944.

It can be divided in two parts, 139093 and 8648, that added together give a palindrome (147741).

The spelling of 1390938648 in words is "one billion, three hundred ninety million, nine hundred thirty-eight thousand, six hundred forty-eight".