16494821 has 12 divisors (see below), whose sum is σ = 19808640. Its totient is φ = 13681080.

The previous prime is 16494817. The next prime is 16494847. The reversal of 16494821 is 12849461.

It is a happy number.

It is not a de Polignac number, because 16494821 - 2² = 16494817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16494851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3911 + ... + 6948.

It is an arithmetic number, because the mean of its divisors is an integer number (1650720).

Almost surely, 2^16494821 is an apocalyptic number.

It is an amenable number.

16494821 is a deficient number, since it is larger than the sum of its proper divisors (3313819).

16494821 is a wasteful number, since it uses less digits than its factorization.

16494821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10904 (or 10897 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 16494821 is about 4061.3816614546. The cubic root of 16494821 is about 254.5555297148. Note that the first 4 decimals are identical.

The spelling of 16494821 in words is "sixteen million, four hundred ninety-four thousand, eight hundred twenty-one".