18196709 has 2 divisors, whose sum is σ = 18196710. Its totient is φ = 18196708.

The previous prime is 18196691. The next prime is 18196733. The reversal of 18196709 is 90769181.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15880225 + 2316484 = 3985^2 + 1522^2 .

It is a cyclic number.

It is not a de Polignac number, because 18196709 - 2¹² = 18192613 is a prime.

It is a super-2 number, since 2×18196709² = 662240436861362, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18196769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9098354 + 9098355.

It is an arithmetic number, because the mean of its divisors is an integer number (9098355).

Almost surely, 2^18196709 is an apocalyptic number.

It is an amenable number.

18196709 is a deficient number, since it is larger than the sum of its proper divisors (1).

18196709 is an equidigital number, since it uses as much as digits as its factorization.

18196709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 18196709 is about 4265.7600729530. The cubic root of 18196709 is about 263.0253557361.

The spelling of 18196709 in words is "eighteen million, one hundred ninety-six thousand, seven hundred nine".