213938635 has 4 divisors (see below), whose sum is σ = 256726368. Its totient is φ = 171150904.

The previous prime is 213938633. The next prime is 213938701. The reversal of 213938635 is 536839312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213938635 - 2¹ = 213938633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213938633) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 21393859 + ... + 21393868.

It is an arithmetic number, because the mean of its divisors is an integer number (64181592).

Almost surely, 2^213938635 is an apocalyptic number.

213938635 is a deficient number, since it is larger than the sum of its proper divisors (42787733).

213938635 is an equidigital number, since it uses as much as digits as its factorization.

213938635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42787732.

The product of its digits is 116640, while the sum is 40.

The square root of 213938635 is about 14626.6412754262. The cubic root of 213938635 is about 598.0852245959.

The spelling of 213938635 in words is "two hundred thirteen million, nine hundred thirty-eight thousand, six hundred thirty-five".