393963966 has 32 divisors (see below), whose sum is σ = 955065600. Its totient is φ = 119382840.

The previous prime is 393963943. The next prime is 393963971. The reversal of 393963966 is 669369393.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 331026 + ... + 332213.

It is an arithmetic number, because the mean of its divisors is an integer number (29845800).

Almost surely, 2^393963966 is an apocalyptic number.

393963966 is an abundant number, since it is smaller than the sum of its proper divisors (561101634).

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

393963966 is a wasteful number, since it uses less digits than its factorization.

393963966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663261 (or 663255 counting only the distinct ones).

The product of its digits is 4251528, while the sum is 54.

The square root of 393963966 is about 19848.5255371778. The cubic root of 393963966 is about 733.0813432183.

The spelling of 393963966 in words is "three hundred ninety-three million, nine hundred sixty-three thousand, nine hundred sixty-six".