213948809 has 8 divisors (see below), whose sum is σ = 218394240. Its totient is φ = 209530800.

The previous prime is 213948803. The next prime is 213948817. The reversal of 213948809 is 908849312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213948809 is a prime.

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 213948809.

It is not an unprimeable number, because it can be changed into a prime (213948803) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 9299 + ... + 22679.

It is an arithmetic number, because the mean of its divisors is an integer number (27299280).

Almost surely, 2^213948809 is an apocalyptic number.

It is an amenable number.

213948809 is a deficient number, since it is larger than the sum of its proper divisors (4445431).

213948809 is a wasteful number, since it uses less digits than its factorization.

213948809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13711.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 213948809 is about 14626.9890613209. The cubic root of 213948809 is about 598.0947052313.

It can be divided in two parts, 21394 and 8809, that added together give a palindrome (30203).

The spelling of 213948809 in words is "two hundred thirteen million, nine hundred forty-eight thousand, eight hundred nine".