398000809 has 16 divisors (see below), whose sum is σ = 440023680. Its totient is φ = 358300800.

The previous prime is 398000807. The next prime is 398000839. The reversal of 398000809 is 908000893.

It is a cyclic number.

It is not a de Polignac number, because 398000809 - 2¹ = 398000807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398000807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65709 + ... + 71509.

It is an arithmetic number, because the mean of its divisors is an integer number (27501480).

Almost surely, 2^398000809 is an apocalyptic number.

It is an amenable number.

398000809 is a deficient number, since it is larger than the sum of its proper divisors (42022871).

398000809 is a wasteful number, since it uses less digits than its factorization.

398000809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6000.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 398000809 is about 19949.9576190026. The cubic root of 398000809 is about 735.5767352327.

The spelling of 398000809 in words is "three hundred ninety-eight million, eight hundred nine", and thus it is an aban number.