12720170 has 16 divisors (see below), whose sum is σ = 22955400. Its totient is φ = 5074944.

The previous prime is 12720163. The next prime is 12720179. The reversal of 12720170 is 7102721.

It can be written as a sum of positive squares in 4 ways, for example, as 10195249 + 2524921 = 3193^2 + 1589^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12720179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3074 + ... + 5906.

Almost surely, 2^12720170 is an apocalyptic number.

12720170 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12720170 is a deficient number, since it is larger than the sum of its proper divisors (10235230).

12720170 is a wasteful number, since it uses less digits than its factorization.

12720170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3289.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 12720170 is about 3566.5347327623. The cubic root of 12720170 is about 233.4341038659.

Adding to 12720170 its reverse (7102721), we get a palindrome (19822891).

The spelling of 12720170 in words is "twelve million, seven hundred twenty thousand, one hundred seventy".