16809290 has 8 divisors (see below), whose sum is σ = 30256740. Its totient is φ = 6723712.

The previous prime is 16809283. The next prime is 16809293. The reversal of 16809290 is 9290861.

It can be written as a sum of positive squares in 2 ways, for example, as 16589329 + 219961 = 4073^2 + 469^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 16809290.

It is not an unprimeable number, because it can be changed into a prime (16809293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 840455 + ... + 840474.

Almost surely, 2^16809290 is an apocalyptic number.

16809290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16809290 is a deficient number, since it is larger than the sum of its proper divisors (13447450).

16809290 is a wasteful number, since it uses less digits than its factorization.

16809290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680936.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 16809290 is about 4099.9134137199. The cubic root of 16809290 is about 256.1630329510.

The spelling of 16809290 in words is "sixteen million, eight hundred nine thousand, two hundred ninety".