398879209 has 4 divisors (see below), whose sum is σ = 400351360. Its totient is φ = 397407060.

The previous prime is 398879191. The next prime is 398879231. The reversal of 398879209 is 902978893.

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.

It is a cyclic number.

It is not a de Polignac number, because 398879209 - 2¹¹ = 398877161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 398879209.

It is not an unprimeable number, because it can be changed into a prime (398879269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 735669 + ... + 736210.

It is an arithmetic number, because the mean of its divisors is an integer number (100087840).

Almost surely, 2^398879209 is an apocalyptic number.

It is an amenable number.

398879209 is a deficient number, since it is larger than the sum of its proper divisors (1472151).

398879209 is a wasteful number, since it uses less digits than its factorization.

398879209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1472150.

The product of its (nonzero) digits is 1959552, while the sum is 55.

The square root of 398879209 is about 19971.9605697588. The cubic root of 398879209 is about 736.1174844207.

The spelling of 398879209 in words is "three hundred ninety-eight million, eight hundred seventy-nine thousand, two hundred nine".