12390281 has 12 divisors (see below), whose sum is σ = 13000320. Its totient is φ = 11804520.

The previous prime is 12390253. The next prime is 12390289. The reversal of 12390281 is 18209321.

12390281 = T₂₂₉ + T₂₃₀ + ... + T₄₄₁.

It is not a de Polignac number, because 12390281 - 2¹⁴ = 12373897 is a prime.

It is a super-2 number, since 2×12390281² = 307038126517922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12390281.

It is not an unprimeable number, because it can be changed into a prime (12390289) 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, 156800 + ... + 156878.

It is an arithmetic number, because the mean of its divisors is an integer number (1083360).

Almost surely, 2^12390281 is an apocalyptic number.

It is an amenable number.

12390281 is a deficient number, since it is larger than the sum of its proper divisors (610039).

12390281 is an frugal number, since it uses more digits than its factorization.

12390281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 12390281 is about 3519.9830965503. The cubic root of 12390281 is about 231.3984178966.

The spelling of 12390281 in words is "twelve million, three hundred ninety thousand, two hundred eighty-one".