1399109 has 2 divisors, whose sum is σ = 1399110. Its totient is φ = 1399108.

The previous prime is 1399063. The next prime is 1399121. The reversal of 1399109 is 9019931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1221025 + 178084 = 1105^2 + 422^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1399109 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1399129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699554 + 699555.

It is an arithmetic number, because the mean of its divisors is an integer number (699555).

2^1399109 is an apocalyptic number.

It is an amenable number.

1399109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399109 is an equidigital number, since it uses as much as digits as its factorization.

1399109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2187, while the sum is 32.

The square root of 1399109 is about 1182.8393804740. The cubic root of 1399109 is about 111.8451569849.

The spelling of 1399109 in words is "one million, three hundred ninety-nine thousand, one hundred nine".