398221215 has 32 divisors (see below), whose sum is σ = 730329600. Its totient is φ = 181505664.

The previous prime is 398221211. The next prime is 398221217. The reversal of 398221215 is 512122893.

It is a happy number.

It is not a de Polignac number, because 398221215 - 2² = 398221211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398221211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31212 + ... + 42078.

It is an arithmetic number, because the mean of its divisors is an integer number (22822800).

Almost surely, 2^398221215 is an apocalyptic number.

398221215 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

398221215 is a deficient number, since it is larger than the sum of its proper divisors (332108385).

398221215 is a wasteful number, since it uses less digits than its factorization.

398221215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11231.

The product of its digits is 8640, while the sum is 33.

The square root of 398221215 is about 19955.4808260788. The cubic root of 398221215 is about 735.7124934221.

The spelling of 398221215 in words is "three hundred ninety-eight million, two hundred twenty-one thousand, two hundred fifteen".