393889078 has 48 divisors (see below), whose sum is σ = 680425200. Its totient is φ = 169545600.

The previous prime is 393889061. The next prime is 393889079. The reversal of 393889078 is 870988393.

It is a super-3 number, since 3×393889078³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393889079) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1128448 + ... + 1128796.

It is an arithmetic number, because the mean of its divisors is an integer number (14175525).

Almost surely, 2^393889078 is an apocalyptic number.

393889078 is a deficient number, since it is larger than the sum of its proper divisors (286536122).

393889078 is a wasteful number, since it uses less digits than its factorization.

393889078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481 (or 452 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 55.

The square root of 393889078 is about 19846.6389597836. The cubic root of 393889078 is about 733.0348901758.

The spelling of 393889078 in words is "three hundred ninety-three million, eight hundred eighty-nine thousand, seventy-eight".