10209812 has 12 divisors (see below), whose sum is σ = 18031860. Its totient is φ = 5057856.

The previous prime is 10209803. The next prime is 10209863. The reversal of 10209812 is 21890201.

It can be written as a sum of positive squares in 2 ways, for example, as 5740816 + 4468996 = 2396^2 + 2114^2 .

It is a super-2 number, since 2×10209812² = 208480522150688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11273 + ... + 12144.

It is an arithmetic number, because the mean of its divisors is an integer number (1502655).

Almost surely, 2^10209812 is an apocalyptic number.

It is an amenable number.

10209812 is a deficient number, since it is larger than the sum of its proper divisors (7822048).

10209812 is a wasteful number, since it uses less digits than its factorization.

10209812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23530 (or 23528 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 10209812 is about 3195.2796434741. The cubic root of 10209812 is about 216.9398064762.

The spelling of 10209812 in words is "ten million, two hundred nine thousand, eight hundred twelve".