1399856544 has 144 divisors (see below), whose sum is σ = 4176349632. Its totient is φ = 443925504.

The previous prime is 1399856533. The next prime is 1399856573. The reversal of 1399856544 is 4456589931.

1399856544 is a `hidden beast` number, since 1 + 3 + 9 + 98 + 5 + 6 + 544 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1542939 + ... + 1543845.

It is an arithmetic number, because the mean of its divisors is an integer number (29002428).

Almost surely, 2^1399856544 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 1399856544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2088174816).

1399856544 is an abundant number, since it is smaller than the sum of its proper divisors (2776493088).

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

1399856544 is a wasteful number, since it uses less digits than its factorization.

1399856544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179 (or 1168 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 54.

The square root of 1399856544 is about 37414.6568071926. The cubic root of 1399856544 is about 1118.6507306236.

The spelling of 1399856544 in words is "one billion, three hundred ninety-nine million, eight hundred fifty-six thousand, five hundred forty-four".