3898309 has 4 divisors (see below), whose sum is σ = 3971916. Its totient is φ = 3824704.

The previous prime is 3898303. The next prime is 3898319. The reversal of 3898309 is 9038983.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2265025 + 1633284 = 1505^2 + 1278^2 .

It is a cyclic number.

It is not a de Polignac number, because 3898309 - 2⁹ = 3897797 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3898303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36724 + ... + 36829.

It is an arithmetic number, because the mean of its divisors is an integer number (992979).

Almost surely, 2^3898309 is an apocalyptic number.

It is an amenable number.

3898309 is a deficient number, since it is larger than the sum of its proper divisors (73607).

3898309 is an equidigital number, since it uses as much as digits as its factorization.

3898309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73606.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 3898309 is about 1974.4135838269. The cubic root of 3898309 is about 157.3833384853.

The spelling of 3898309 in words is "three million, eight hundred ninety-eight thousand, three hundred nine".