213956805 has 8 divisors (see below), whose sum is σ = 342330912. Its totient is φ = 114110288.

The previous prime is 213956803. The next prime is 213956839. The reversal of 213956805 is 508659312.

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

It is a cyclic number.

It is not a de Polignac number, because 213956805 - 2¹ = 213956803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213956803) 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, 7131879 + ... + 7131908.

It is an arithmetic number, because the mean of its divisors is an integer number (42791364).

Almost surely, 2^213956805 is an apocalyptic number.

It is an amenable number.

213956805 is a deficient number, since it is larger than the sum of its proper divisors (128374107).

213956805 is a wasteful number, since it uses less digits than its factorization.

213956805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14263795.

The product of its (nonzero) digits is 64800, while the sum is 39.

The square root of 213956805 is about 14627.2623891144. The cubic root of 213956805 is about 598.1021560879.

The spelling of 213956805 in words is "two hundred thirteen million, nine hundred fifty-six thousand, eight hundred five".