213818505 has 8 divisors (see below), whose sum is σ = 342109632. Its totient is φ = 114036528.

The previous prime is 213818467. The next prime is 213818509. The reversal of 213818505 is 505818312.

It is a happy number.

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

It is not a de Polignac number, because 213818505 - 2¹⁰ = 213817481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213818509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7127269 + ... + 7127298.

It is an arithmetic number, because the mean of its divisors is an integer number (42763704).

Almost surely, 2^213818505 is an apocalyptic number.

It is an amenable number.

213818505 is a deficient number, since it is larger than the sum of its proper divisors (128291127).

213818505 is a wasteful number, since it uses less digits than its factorization.

213818505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14254575.

The product of its (nonzero) digits is 9600, while the sum is 33.

The square root of 213818505 is about 14622.5341510971. The cubic root of 213818505 is about 597.9732587976.

The spelling of 213818505 in words is "two hundred thirteen million, eight hundred eighteen thousand, five hundred five".