390030221 has 4 divisors (see below), whose sum is σ = 445748832. Its totient is φ = 334311612.

The previous prime is 390030211. The next prime is 390030227. The reversal of 390030221 is 122030093.

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 390030221 - 2¹⁸ = 389768077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 390030193 and 390030202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390030227) 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, 27859295 + ... + 27859308.

It is an arithmetic number, because the mean of its divisors is an integer number (111437208).

Almost surely, 2^390030221 is an apocalyptic number.

It is an amenable number.

390030221 is a deficient number, since it is larger than the sum of its proper divisors (55718611).

390030221 is an equidigital number, since it uses as much as digits as its factorization.

390030221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55718610.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 390030221 is about 19749.1827932196. The cubic root of 390030221 is about 730.6332286253.

The spelling of 390030221 in words is "three hundred ninety million, thirty thousand, two hundred twenty-one".