10209945 has 16 divisors (see below), whose sum is σ = 17297280. Its totient is φ = 5124864.

The previous prime is 10209931. The next prime is 10209961. The reversal of 10209945 is 54990201.

It is a happy number.

It is not a de Polignac number, because 10209945 - 2¹⁰ = 10208921 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 19765 + ... + 20274.

It is an arithmetic number, because the mean of its divisors is an integer number (1081080).

Almost surely, 2^10209945 is an apocalyptic number.

10209945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10209945 is a deficient number, since it is larger than the sum of its proper divisors (7087335).

10209945 is a wasteful number, since it uses less digits than its factorization.

10209945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40064.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 10209945 is about 3195.3004553563. The cubic root of 10209945 is about 216.9407484743.

The spelling of 10209945 in words is "ten million, two hundred nine thousand, nine hundred forty-five".