398000909 has 4 divisors (see below), whose sum is σ = 410839680. Its totient is φ = 385162140.

The previous prime is 398000881. The next prime is 398000963. The reversal of 398000909 is 909000893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 909000893 = 9887 ⋅91939.

It is a cyclic number.

It is not a de Polignac number, because 398000909 - 2¹² = 397996813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398000509) 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, 6419339 + ... + 6419400.

It is an arithmetic number, because the mean of its divisors is an integer number (102709920).

Almost surely, 2^398000909 is an apocalyptic number.

It is an amenable number.

398000909 is a deficient number, since it is larger than the sum of its proper divisors (12838771).

398000909 is a wasteful number, since it uses less digits than its factorization.

398000909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12838770.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 398000909 is about 19949.9601252734. The cubic root of 398000909 is about 735.5767968387.

The spelling of 398000909 in words is "three hundred ninety-eight million, nine hundred nine", and thus it is an aban number.