16390905 has 16 divisors (see below), whose sum is σ = 26482560. Its totient is φ = 8656944.

The previous prime is 16390903. The next prime is 16390919. The reversal of 16390905 is 50909361.

It is not a de Polignac number, because 16390905 - 2¹ = 16390903 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16390903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159084 + ... + 159186.

It is an arithmetic number, because the mean of its divisors is an integer number (1655160).

Almost surely, 2^16390905 is an apocalyptic number.

16390905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16390905 is a deficient number, since it is larger than the sum of its proper divisors (10091655).

16390905 is an frugal number, since it uses more digits than its factorization.

16390905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 33.

The square root of 16390905 is about 4048.5682654489. The cubic root of 16390905 is about 254.0198436560.

The spelling of 16390905 in words is "sixteen million, three hundred ninety thousand, nine hundred five".