1399999 has 2 divisors, whose sum is σ = 1400000. Its totient is φ = 1399998.

The previous prime is 1399963. The next prime is 1400017. The reversal of 1399999 is 9999931.

It is a strong prime.

It is an emirp because it is prime and its reverse (9999931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1399999 - 2¹¹ = 1397951 is a prime.

It is an Ulam number.

1399999 is a modest number, since divided by 9999 gives 139 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1399919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699999 + 700000.

It is an arithmetic number, because the mean of its divisors is an integer number (700000).

2^1399999 is an apocalyptic number.

1399999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399999 is an equidigital number, since it uses as much as digits as its factorization.

1399999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 177147, while the sum is 49.

The square root of 1399999 is about 1183.2155340427. The cubic root of 1399999 is about 111.8688675727.

The spelling of 1399999 in words is "one million, three hundred ninety-nine thousand, nine hundred ninety-nine".