1399663 has 2 divisors, whose sum is σ = 1399664. Its totient is φ = 1399662.

The previous prime is 1399639. The next prime is 1399679. The reversal of 1399663 is 3669931.

It is a strong prime.

It is an emirp because it is prime and its reverse (3669931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1399663 is a prime.

It is a nialpdrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1399603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699831 + 699832.

It is an arithmetic number, because the mean of its divisors is an integer number (699832).

2^1399663 is an apocalyptic number.

1399663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399663 is an equidigital number, since it uses as much as digits as its factorization.

1399663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26244, while the sum is 37.

The square root of 1399663 is about 1183.0735395570. The cubic root of 1399663 is about 111.8599173408.

The spelling of 1399663 in words is "one million, three hundred ninety-nine thousand, six hundred sixty-three".