409994216 has 8 divisors (see below), whose sum is σ = 768739170. Its totient is φ = 204997104.

The previous prime is 409994213. The next prime is 409994231. The reversal of 409994216 is 612499904.

It can be written as a sum of positive squares in only one way, i.e., 267191716 + 142802500 = 16346^2 + 11950^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (409994213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25624631 + ... + 25624646.

Almost surely, 2^409994216 is an apocalyptic number.

It is an amenable number.

409994216 is a deficient number, since it is larger than the sum of its proper divisors (358744954).

409994216 is a wasteful number, since it uses less digits than its factorization.

409994216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51249283 (or 51249279 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 409994216 is about 20248.3139051132. The cubic root of 409994216 is about 742.8923907056.

The spelling of 409994216 in words is "four hundred nine million, nine hundred ninety-four thousand, two hundred sixteen".