394935580 has 48 divisors (see below), whose sum is σ = 903972384. Its totient is φ = 144057600.

The previous prime is 394935559. The next prime is 394935581. The reversal of 394935580 is 85539493.

It is a happy number.

It is a super-2 number, since 2×394935580² = 311948224699872800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 394935580.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394935581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12430 + ... + 30730.

It is an arithmetic number, because the mean of its divisors is an integer number (18832758).

Almost surely, 2^394935580 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 394935580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (451986192).

394935580 is an abundant number, since it is smaller than the sum of its proper divisors (509036804).

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

394935580 is a wasteful number, since it uses less digits than its factorization.

394935580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18406 (or 18404 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 46.

The square root of 394935580 is about 19872.9861872845. The cubic root of 394935580 is about 733.6835026469.

The spelling of 394935580 in words is "three hundred ninety-four million, nine hundred thirty-five thousand, five hundred eighty".