1399844863 has 4 divisors (see below), whose sum is σ = 1400117400. Its totient is φ = 1399572328.

The previous prime is 1399844857. The next prime is 1399844867. The reversal of 1399844863 is 3684489931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3684489931 = 45259 ⋅81409.

It is a cyclic number.

It is not a de Polignac number, because 1399844863 - 2⁹ = 1399844351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399844867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128413 + ... + 138886.

It is an arithmetic number, because the mean of its divisors is an integer number (350029350).

Almost surely, 2^1399844863 is an apocalyptic number.

1399844863 is a deficient number, since it is larger than the sum of its proper divisors (272537).

1399844863 is an equidigital number, since it uses as much as digits as its factorization.

1399844863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272536.

The product of its digits is 4478976, while the sum is 55.

The square root of 1399844863 is about 37414.5007049406. The cubic root of 1399844863 is about 1118.6476191154.

The spelling of 1399844863 in words is "one billion, three hundred ninety-nine million, eight hundred forty-four thousand, eight hundred sixty-three".