1399213 has 2 divisors, whose sum is σ = 1399214. Its totient is φ = 1399212.

The previous prime is 1399201. The next prime is 1399231. The reversal of 1399213 is 3129931.

Together with next prime (1399231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1087849 + 311364 = 1043^2 + 558^2 .

It is a cyclic number.

It is not a de Polignac number, because 1399213 - 2⁹ = 1398701 is a prime.

1399213 is a lucky number.

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 (1399273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699606 + 699607.

It is an arithmetic number, because the mean of its divisors is an integer number (699607).

2^1399213 is an apocalyptic number.

It is an amenable number.

1399213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399213 is an equidigital number, since it uses as much as digits as its factorization.

1399213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1458, while the sum is 28.

The square root of 1399213 is about 1182.8833416698. The cubic root of 1399213 is about 111.8479281791.

The spelling of 1399213 in words is "one million, three hundred ninety-nine thousand, two hundred thirteen".