685383930 has 384 divisors, whose sum is σ = 2387105280. Its totient is φ = 138568320.

The previous prime is 685383911. The next prime is 685383931. The reversal of 685383930 is 39383586.

It is a super-2 number, since 2×685383930² = 939502263004489800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (685383931) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 18523872 + ... + 18523908.

It is an arithmetic number, because the mean of its divisors is an integer number (6216420).

Almost surely, 2^685383930 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685383930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1193552640).

685383930 is an abundant number, since it is smaller than the sum of its proper divisors (1701721350).

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

685383930 is a wasteful number, since it uses less digits than its factorization.

685383930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The square root of 685383930 is about 26179.8382347943. The cubic root of 685383930 is about 881.6806423973.

The spelling of 685383930 in words is "six hundred eighty-five million, three hundred eighty-three thousand, nine hundred thirty".