16870905 has 12 divisors (see below), whose sum is σ = 29242980. Its totient is φ = 8997792.

The previous prime is 16870901. The next prime is 16870933. The reversal of 16870905 is 50907861.

It can be written as a sum of positive squares in 2 ways, for example, as 12257001 + 4613904 = 3501^2 + 2148^2 .

It is not a de Polignac number, because 16870905 - 2² = 16870901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16870905.

It is not an unprimeable number, because it can be changed into a prime (16870901) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 187410 + ... + 187499.

It is an arithmetic number, because the mean of its divisors is an integer number (2436915).

Almost surely, 2^16870905 is an apocalyptic number.

16870905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16870905 is a deficient number, since it is larger than the sum of its proper divisors (12372075).

16870905 is a wasteful number, since it uses less digits than its factorization.

16870905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374920 (or 374917 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 16870905 is about 4107.4207235198. The cubic root of 16870905 is about 256.4756426149.

The spelling of 16870905 in words is "sixteen million, eight hundred seventy thousand, nine hundred five".