1391998144 has 56 divisors (see below), whose sum is σ = 2865638160. Its totient is φ = 670086144.

The previous prime is 1391998129. The next prime is 1391998147. The reversal of 1391998144 is 4418991931.

It is not an unprimeable number, because it can be changed into a prime (1391998147) 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 7 ways as a sum of consecutive naturals, for example, 821362 + ... + 823054.

It is an arithmetic number, because the mean of its divisors is an integer number (51172110).

Almost surely, 2^1391998144 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 1391998144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1432819080).

1391998144 is an abundant number, since it is smaller than the sum of its proper divisors (1473640016).

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

1391998144 is a wasteful number, since it uses less digits than its factorization.

1391998144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2177 (or 2167 counting only the distinct ones).

The product of its digits is 279936, while the sum is 49.

The square root of 1391998144 is about 37309.4913393362. The cubic root of 1391998144 is about 1116.5535380852.

The spelling of 1391998144 in words is "one billion, three hundred ninety-one million, nine hundred ninety-eight thousand, one hundred forty-four".