1399263243 has 32 divisors (see below), whose sum is σ = 2170847232. Its totient is φ = 785181600.

The previous prime is 1399263233. The next prime is 1399263263. The reversal of 1399263243 is 3423629931.

It is not a de Polignac number, because 1399263243 - 2⁸ = 1399262987 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1399263195 and 1399263204.

It is not an unprimeable number, because it can be changed into a prime (1399263233) 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 31 ways as a sum of consecutive naturals, for example, 402330 + ... + 405792.

It is an arithmetic number, because the mean of its divisors is an integer number (67838976).

Almost surely, 2^1399263243 is an apocalyptic number.

1399263243 is a deficient number, since it is larger than the sum of its proper divisors (771583989).

1399263243 is a wasteful number, since it uses less digits than its factorization.

1399263243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3815.

The product of its digits is 209952, while the sum is 42.

The square root of 1399263243 is about 37406.7272425696. The cubic root of 1399263243 is about 1118.4926690978.

The spelling of 1399263243 in words is "one billion, three hundred ninety-nine million, two hundred sixty-three thousand, two hundred forty-three".