394221100 has 72 divisors (see below), whose sum is σ = 1052897888. Its totient is φ = 124761600.

The previous prime is 394221059. The next prime is 394221103. The reversal of 394221100 is 1122493.

It is not an unprimeable number, because it can be changed into a prime (394221103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12561 + ... + 30760.

Almost surely, 2^394221100 is an apocalyptic number.

It is an amenable number.

394221100 is an abundant number, since it is smaller than the sum of its proper divisors (658676788).

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

394221100 is a wasteful number, since it uses less digits than its factorization.

394221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43355 (or 43348 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 394221100 is about 19855.0018886929. The cubic root of 394221100 is about 733.2407987006.

Adding to 394221100 its reverse (1122493), we get a palindrome (395343593).

It can be divided in two parts, 394 and 221100, that multiplied together give a triangular number (87113400 = T₁₃₁₉₉).

The spelling of 394221100 in words is "three hundred ninety-four million, two hundred twenty-one thousand, one hundred".