3698509 has 2 divisors, whose sum is σ = 3698510. Its totient is φ = 3698508.

The previous prime is 3698507. The next prime is 3698531. The reversal of 3698509 is 9058963.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2205225 + 1493284 = 1485^2 + 1222^2 .

It is an emirp because it is prime and its reverse (9058963) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3698509 - 2¹ = 3698507 is a prime.

Together with 3698507, it forms a pair of twin primes.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3698507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1849254 + 1849255.

It is an arithmetic number, because the mean of its divisors is an integer number (1849255).

Almost surely, 2^3698509 is an apocalyptic number.

It is an amenable number.

3698509 is a deficient number, since it is larger than the sum of its proper divisors (1).

3698509 is an equidigital number, since it uses as much as digits as its factorization.

3698509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 3698509 is about 1923.1508001194. The cubic root of 3698509 is about 154.6472589063.

The spelling of 3698509 in words is "three million, six hundred ninety-eight thousand, five hundred nine".