398363905 has 4 divisors (see below), whose sum is σ = 478036692. Its totient is φ = 318691120.

The previous prime is 398363893. The next prime is 398363909. The reversal of 398363905 is 509363893.

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 298183824 + 100180081 = 17268^2 + 10009^2 .

It is not a de Polignac number, because 398363905 - 2⁹ = 398363393 is a prime.

It is a super-3 number, since 3×398363905³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398363909) 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, 39836386 + ... + 39836395.

It is an arithmetic number, because the mean of its divisors is an integer number (119509173).

Almost surely, 2^398363905 is an apocalyptic number.

It is an amenable number.

398363905 is a deficient number, since it is larger than the sum of its proper divisors (79672787).

398363905 is an equidigital number, since it uses as much as digits as its factorization.

398363905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79672786.

The product of its (nonzero) digits is 524880, while the sum is 46.

The square root of 398363905 is about 19959.0557141364. The cubic root of 398363905 is about 735.8003560436.

The spelling of 398363905 in words is "three hundred ninety-eight million, three hundred sixty-three thousand, nine hundred five".