1399469 has 2 divisors, whose sum is σ = 1399470. Its totient is φ = 1399468.

The previous prime is 1399441. The next prime is 1399471. The reversal of 1399469 is 9649931.

1399469 = 682² + 683² + 684².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 702244 + 697225 = 838^2 + 835^2 .

It is a cyclic number.

It is not a de Polignac number, because 1399469 - 2⁸ = 1399213 is a prime.

It is a super-2 number, since 2×1399469² = 3917026963922, which contains 22 as substring.

Together with 1399471, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1399439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699734 + 699735.

It is an arithmetic number, because the mean of its divisors is an integer number (699735).

2^1399469 is an apocalyptic number.

It is an amenable number.

1399469 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399469 is an equidigital number, since it uses as much as digits as its factorization.

1399469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 41.

The square root of 1399469 is about 1182.9915468844. The cubic root of 1399469 is about 111.8547489951.

The spelling of 1399469 in words is "one million, three hundred ninety-nine thousand, four hundred sixty-nine".