1399997 has 4 divisors (see below), whose sum is σ = 1410816. Its totient is φ = 1389180.

The previous prime is 1399963. The next prime is 1399999. The reversal of 1399997 is 7999931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7999931 = 19 ⋅421049.

It is a cyclic number.

It is not a de Polignac number, because 1399997 - 2¹⁰ = 1398973 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 (1399999) 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 3 ways as a sum of consecutive naturals, for example, 5213 + ... + 5474.

It is an arithmetic number, because the mean of its divisors is an integer number (352704).

2^1399997 is an apocalyptic number.

It is an amenable number.

1399997 is a deficient number, since it is larger than the sum of its proper divisors (10819).

1399997 is a wasteful number, since it uses less digits than its factorization.

1399997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10818.

The product of its digits is 137781, while the sum is 47.

The square root of 1399997 is about 1183.2146888879. The cubic root of 1399997 is about 111.8688143017.

The spelling of 1399997 in words is "one million, three hundred ninety-nine thousand, nine hundred ninety-seven".