12717890 has 16 divisors (see below), whose sum is σ = 23268600. Its totient is φ = 5003520.

The previous prime is 12717889. The next prime is 12717917. The reversal of 12717890 is 9871721.

12717890 = T₆₁₅ + T₆₁₆ + ... + T₆₇₅.

It can be written as a sum of positive squares in 4 ways, for example, as 9665881 + 3052009 = 3109^2 + 1747^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12717890.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9815 + ... + 11034.

Almost surely, 2^12717890 is an apocalyptic number.

12717890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12717890 is a deficient number, since it is larger than the sum of its proper divisors (10550710).

12717890 is a wasteful number, since it uses less digits than its factorization.

12717890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20917.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 12717890 is about 3566.2150804459. The cubic root of 12717890 is about 233.4201558982.

The spelling of 12717890 in words is "twelve million, seven hundred seventeen thousand, eight hundred ninety".