394022500 has 45 divisors (see below), whose sum is σ = 863824269. Its totient is φ = 157212000.

The previous prime is 394022467. The next prime is 394022521. The reversal of 394022500 is 5220493.

It is a happy number.

The square root of 394022500 is 19850.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 240064036 + 153958464 = 15494^2 + 12408^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 992302 + ... + 992698.

Almost surely, 2^394022500 is an apocalyptic number.

394022500 is the 19850-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 394022500

394022500 is an abundant number, since it is smaller than the sum of its proper divisors (469801769).

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

394022500 is an frugal number, since it uses more digits than its factorization.

394022500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The cubic root of 394022500 is about 733.1176477724.

Multiplying 394022500 by its sum of digits (25), we get a square (9850562500 = 99250²).

394022500 divided by its sum of digits (25) gives a square (15760900 = 3970²).

Adding to 394022500 its reverse (5220493), we get a palindrome (399242993).

The spelling of 394022500 in words is "three hundred ninety-four million, twenty-two thousand, five hundred".