12281690 has 16 divisors (see below), whose sum is σ = 22525128. Its totient is φ = 4819776.

The previous prime is 12281671. The next prime is 12281693. The reversal of 12281690 is 9618221.

It can be written as a sum of positive squares in 4 ways, for example, as 7295401 + 4986289 = 2701^2 + 2233^2 .

It is a super-2 number, since 2×12281690² = 301679818512200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12281693) 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, 11057 + ... + 12116.

Almost surely, 2^12281690 is an apocalyptic number.

12281690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12281690 is a deficient number, since it is larger than the sum of its proper divisors (10243438).

12281690 is a wasteful number, since it uses less digits than its factorization.

12281690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23233.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 12281690 is about 3504.5242187778. The cubic root of 12281690 is about 230.7204253769.

The spelling of 12281690 in words is "twelve million, two hundred eighty-one thousand, six hundred ninety".