1399563871 has 16 divisors (see below), whose sum is σ = 1458037504. Its totient is φ = 1342401984.

The previous prime is 1399563853. The next prime is 1399563899. The reversal of 1399563871 is 1783659931.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1399563871 - 2¹³ = 1399555679 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 (1399561871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1316086 + ... + 1317148.

It is an arithmetic number, because the mean of its divisors is an integer number (91127344).

Almost surely, 2^1399563871 is an apocalyptic number.

1399563871 is a deficient number, since it is larger than the sum of its proper divisors (58473633).

1399563871 is a wasteful number, since it uses less digits than its factorization.

1399563871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630.

The product of its digits is 1224720, while the sum is 52.

The square root of 1399563871 is about 37410.7453948728. The cubic root of 1399563871 is about 1118.5727650906.

The spelling of 1399563871 in words is "one billion, three hundred ninety-nine million, five hundred sixty-three thousand, eight hundred seventy-one".