16409404 has 12 divisors (see below), whose sum is σ = 31327128. Its totient is φ = 7458800.

The previous prime is 16409387. The next prime is 16409411. The reversal of 16409404 is 40490461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186427 + ... + 186514.

It is an arithmetic number, because the mean of its divisors is an integer number (2610594).

Almost surely, 2^16409404 is an apocalyptic number.

It is an amenable number.

16409404 is a deficient number, since it is larger than the sum of its proper divisors (14917724).

16409404 is a wasteful number, since it uses less digits than its factorization.

16409404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372956 (or 372954 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 16409404 is about 4050.8522560074. The cubic root of 16409404 is about 254.1153711527.

Adding to 16409404 its reverse (40490461), we get a palindrome (56899865).

The spelling of 16409404 in words is "sixteen million, four hundred nine thousand, four hundred four".