393968834 has 16 divisors (see below), whose sum is σ = 675966336. Its totient is φ = 168696000.

The previous prime is 393968833. The next prime is 393968849. The reversal of 393968834 is 438869393.

It is a super-2 number, since 2×393968834² = 310422884326639112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (393968831) 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, 5099 + ... + 28529.

It is an arithmetic number, because the mean of its divisors is an integer number (42247896).

Almost surely, 2^393968834 is an apocalyptic number.

393968834 is a deficient number, since it is larger than the sum of its proper divisors (281997502).

393968834 is a wasteful number, since it uses less digits than its factorization.

393968834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24641.

The product of its digits is 3359232, while the sum is 53.

The square root of 393968834 is about 19848.6481655553. The cubic root of 393968834 is about 733.0843626360.

The spelling of 393968834 in words is "three hundred ninety-three million, nine hundred sixty-eight thousand, eight hundred thirty-four".