393930287 has 24 divisors (see below), whose sum is σ = 435848400. Its totient is φ = 354993408.

The previous prime is 393930263. The next prime is 393930293. The reversal of 393930287 is 782039393.

It is not a de Polignac number, because 393930287 - 2¹⁴ = 393913903 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 (393930227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1421993 + ... + 1422269.

It is an arithmetic number, because the mean of its divisors is an integer number (18160350).

Almost surely, 2^393930287 is an apocalyptic number.

393930287 is a deficient number, since it is larger than the sum of its proper divisors (41918113).

393930287 is a wasteful number, since it uses less digits than its factorization.

393930287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443 (or 414 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 44.

The square root of 393930287 is about 19847.6771184942. The cubic root of 393930287 is about 733.0604528559.

The spelling of 393930287 in words is "three hundred ninety-three million, nine hundred thirty thousand, two hundred eighty-seven".