16804638 has 16 divisors (see below), whose sum is σ = 37343760. Its totient is φ = 5601528.

The previous prime is 16804633. The next prime is 16804649. The reversal of 16804638 is 83640861.

It is a happy number.

16804638 is a `hidden beast` number, since 16 + 8 + 0 + 4 + 638 = 666.

It is a super-2 number, since 2×16804638² = 564791716622088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16804633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155545 + ... + 155652.

It is an arithmetic number, because the mean of its divisors is an integer number (2333985).

Almost surely, 2^16804638 is an apocalyptic number.

16804638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

16804638 is an abundant number, since it is smaller than the sum of its proper divisors (20539122).

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

16804638 is a wasteful number, since it uses less digits than its factorization.

16804638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311208 (or 311202 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 16804638 is about 4099.3460454077. The cubic root of 16804638 is about 256.1393995836.

The spelling of 16804638 in words is "sixteen million, eight hundred four thousand, six hundred thirty-eight".