398051221 has 8 divisors (see below), whose sum is σ = 404559200. Its totient is φ = 391560048.

The previous prime is 398051183. The next prime is 398051231. The reversal of 398051221 is 122150893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 398051221 - 2¹¹ = 398049173 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 (398051231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48955 + ... + 56503.

It is an arithmetic number, because the mean of its divisors is an integer number (50569900).

Almost surely, 2^398051221 is an apocalyptic number.

It is an amenable number.

398051221 is a deficient number, since it is larger than the sum of its proper divisors (6507979).

398051221 is an equidigital number, since it uses as much as digits as its factorization.

398051221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8403.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 398051221 is about 19951.2210403273. The cubic root of 398051221 is about 735.6077907214.

The spelling of 398051221 in words is "three hundred ninety-eight million, fifty-one thousand, two hundred twenty-one".