394992220 has 48 divisors (see below), whose sum is σ = 949314240. Its totient is φ = 135235584.

The previous prime is 394992217. The next prime is 394992223. The reversal of 394992220 is 22299493.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (394992217) and next prime (394992223).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394992223) 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, 128542 + ... + 131578.

It is an arithmetic number, because the mean of its divisors is an integer number (19777380).

Almost surely, 2^394992220 is an apocalyptic number.

It is an amenable number.

394992220 is an abundant number, since it is smaller than the sum of its proper divisors (554322020).

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

394992220 is a wasteful number, since it uses less digits than its factorization.

394992220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3982 (or 3980 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 394992220 is about 19874.4111862465. The cubic root of 394992220 is about 733.7185749045.

It can be divided in two parts, 3949 and 92220, that added together give a palindrome (96169).

The spelling of 394992220 in words is "three hundred ninety-four million, nine hundred ninety-two thousand, two hundred twenty".