646222399 has 8 divisors (see below), whose sum is σ = 672246000. Its totient is φ = 620448192.

The previous prime is 646222397. The next prime is 646222403. The reversal of 646222399 is 993222646.

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 646222399 - 2¹ = 646222397 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 (646222391) 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, 57054 + ... + 67435.

It is an arithmetic number, because the mean of its divisors is an integer number (84030750).

Almost surely, 2^646222399 is an apocalyptic number.

646222399 is a deficient number, since it is larger than the sum of its proper divisors (26023601).

646222399 is a wasteful number, since it uses less digits than its factorization.

646222399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124697.

The product of its digits is 279936, while the sum is 43.

The square root of 646222399 is about 25420.9047635996. The cubic root of 646222399 is about 864.5577384328.

The spelling of 646222399 in words is "six hundred forty-six million, two hundred twenty-two thousand, three hundred ninety-nine".