213842909 has 12 divisors (see below), whose sum is σ = 250030044. Its totient is φ = 182355264.

The previous prime is 213842899. The next prime is 213842939. The reversal of 213842909 is 909248312.

It can be written as a sum of positive squares in 2 ways, for example, as 117115684 + 96727225 = 10822^2 + 9835^2 .

It is not a de Polignac number, because 213842909 - 2⁸ = 213842653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213842939) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1424 + ... + 20729.

It is an arithmetic number, because the mean of its divisors is an integer number (20835837).

Almost surely, 2^213842909 is an apocalyptic number.

It is an amenable number.

213842909 is a deficient number, since it is larger than the sum of its proper divisors (36187135).

213842909 is a wasteful number, since it uses less digits than its factorization.

213842909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22364 (or 22357 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 213842909 is about 14623.3685927696. The cubic root of 213842909 is about 597.9960076616.

The spelling of 213842909 in words is "two hundred thirteen million, eight hundred forty-two thousand, nine hundred nine".