1393999 has 2 divisors, whose sum is σ = 1394000. Its totient is φ = 1393998.

The previous prime is 1393991. The next prime is 1394009. The reversal of 1393999 is 9993931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1393999 - 2³ = 1393991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1393991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696999 + 697000.

It is an arithmetic number, because the mean of its divisors is an integer number (697000).

2^1393999 is an apocalyptic number.

1393999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1393999 is an equidigital number, since it uses as much as digits as its factorization.

1393999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 59049, while the sum is 43.

The square root of 1393999 is about 1180.6773479660. The cubic root of 1393999 is about 111.7088259413.

The spelling of 1393999 in words is "one million, three hundred ninety-three thousand, nine hundred ninety-nine".