393646866 has 32 divisors (see below), whose sum is σ = 860502528. Its totient is φ = 119512320.

The previous prime is 393646861. The next prime is 393646867. The reversal of 393646866 is 668646393.

It is a super-2 number, since 2×393646866² = 309915710223243912, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (393646861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59085 + ... + 65408.

It is an arithmetic number, because the mean of its divisors is an integer number (26890704).

Almost surely, 2^393646866 is an apocalyptic number.

393646866 is an abundant number, since it is smaller than the sum of its proper divisors (466855662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

393646866 is a wasteful number, since it uses less digits than its factorization.

393646866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124546.

The product of its digits is 3359232, while the sum is 51.

The square root of 393646866 is about 19840.5359302616. The cubic root of 393646866 is about 732.8846056902.

The spelling of 393646866 in words is "three hundred ninety-three million, six hundred forty-six thousand, eight hundred sixty-six".