394009500 has 96 divisors (see below), whose sum is σ = 1154147904. Its totient is φ = 104448000.

The previous prime is 394009487. The next prime is 394009501. The reversal of 394009500 is 5900493.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394009501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 288820 + ... + 290180.

It is an arithmetic number, because the mean of its divisors is an integer number (12022374).

Almost surely, 2^394009500 is an apocalyptic number.

394009500 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 394009500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (577073952).

394009500 is an abundant number, since it is smaller than the sum of its proper divisors (760138404).

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

394009500 is a wasteful number, since it uses less digits than its factorization.

394009500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576 (or 1564 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 394009500 is about 19849.6725413796. The cubic root of 394009500 is about 733.1095850905.

Adding to 394009500 its reverse (5900493), we get a palindrome (399909993).

The spelling of 394009500 in words is "three hundred ninety-four million, nine thousand, five hundred".