16505090 has 16 divisors (see below), whose sum is σ = 33953472. Its totient is φ = 5658864.

The previous prime is 16505087. The next prime is 16505123. The reversal of 16505090 is 9050561.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117824 + ... + 117963.

It is an arithmetic number, because the mean of its divisors is an integer number (2122092).

Almost surely, 2^16505090 is an apocalyptic number.

16505090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16505090 is an abundant number, since it is smaller than the sum of its proper divisors (17448382).

16505090 is a wasteful number, since it uses less digits than its factorization.

16505090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235801.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 16505090 is about 4062.6456896953. The cubic root of 16505090 is about 254.6083440388.

The spelling of 16505090 in words is "sixteen million, five hundred five thousand, ninety".