13999309 has 2 divisors, whose sum is σ = 13999310. Its totient is φ = 13999308.

The previous prime is 13999301. The next prime is 13999351. The reversal of 13999309 is 90399931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12938409 + 1060900 = 3597^2 + 1030^2 .

It is a cyclic number.

It is not a de Polignac number, because 13999309 - 2³ = 13999301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13999301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6999654 + 6999655.

It is an arithmetic number, because the mean of its divisors is an integer number (6999655).

Almost surely, 2^13999309 is an apocalyptic number.

It is an amenable number.

13999309 is a deficient number, since it is larger than the sum of its proper divisors (1).

13999309 is an equidigital number, since it uses as much as digits as its factorization.

13999309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 59049, while the sum is 43.

The square root of 13999309 is about 3741.5650468754. The cubic root of 13999309 is about 241.0102610944.

The spelling of 13999309 in words is "thirteen million, nine hundred ninety-nine thousand, three hundred nine".