386634221 has 4 divisors (see below), whose sum is σ = 387286812. Its totient is φ = 385981632.

The previous prime is 386634217. The next prime is 386634229. The reversal of 386634221 is 122436683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122436683 = 947 ⋅129289.

It can be written as a sum of positive squares in 2 ways, for example, as 215678596 + 170955625 = 14686^2 + 13075^2 .

It is a cyclic number.

It is not a de Polignac number, because 386634221 - 2² = 386634217 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 (386634229) 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, 325406 + ... + 326591.

It is an arithmetic number, because the mean of its divisors is an integer number (96821703).

Almost surely, 2^386634221 is an apocalyptic number.

It is an amenable number.

386634221 is a deficient number, since it is larger than the sum of its proper divisors (652591).

386634221 is an equidigital number, since it uses as much as digits as its factorization.

386634221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652590.

The product of its digits is 41472, while the sum is 35.

The square root of 386634221 is about 19663.0165793553. The cubic root of 386634221 is about 728.5064986771.

The spelling of 386634221 in words is "three hundred eighty-six million, six hundred thirty-four thousand, two hundred twenty-one".