1399536864 has 144 divisors (see below), whose sum is σ = 4358914560. Its totient is φ = 422426880.

The previous prime is 1399536863. The next prime is 1399536869. The reversal of 1399536864 is 4686359931.

1399536864 is a `hidden beast` number, since 13 + 99 + 536 + 8 + 6 + 4 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1399536864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399536863) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 971857 + ... + 973295.

It is an arithmetic number, because the mean of its divisors is an integer number (30270240).

Almost surely, 2^1399536864 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 1399536864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2179457280).

1399536864 is an abundant number, since it is smaller than the sum of its proper divisors (2959377696).

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

1399536864 is a wasteful number, since it uses less digits than its factorization.

1399536864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1773 (or 1762 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 54.

The square root of 1399536864 is about 37410.3844406871. The cubic root of 1399536864 is about 1118.5655701138.

The spelling of 1399536864 in words is "one billion, three hundred ninety-nine million, five hundred thirty-six thousand, eight hundred sixty-four".