1399609 has 2 divisors, whose sum is σ = 1399610. Its totient is φ = 1399608.

The previous prime is 1399603. The next prime is 1399621. The reversal of 1399609 is 9069931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 714025 + 685584 = 845^2 + 828^2 .

It is a cyclic number.

It is not a de Polignac number, because 1399609 - 2⁵ = 1399577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1399603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699804 + 699805.

It is an arithmetic number, because the mean of its divisors is an integer number (699805).

2^1399609 is an apocalyptic number.

It is an amenable number.

1399609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399609 is an equidigital number, since it uses as much as digits as its factorization.

1399609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 1399609 is about 1183.0507174251. The cubic root of 1399609 is about 111.8584787771.

The spelling of 1399609 in words is "one million, three hundred ninety-nine thousand, six hundred nine".