213638899 has 4 divisors (see below), whose sum is σ = 214368336. Its totient is φ = 212909464.

The previous prime is 213638857. The next prime is 213638917. The reversal of 213638899 is 998836312.

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 213638899 - 2¹¹ = 213636851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213638809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364279 + ... + 364864.

It is an arithmetic number, because the mean of its divisors is an integer number (53592084).

Almost surely, 2^213638899 is an apocalyptic number.

213638899 is a deficient number, since it is larger than the sum of its proper divisors (729437).

213638899 is an equidigital number, since it uses as much as digits as its factorization.

213638899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729436.

The product of its digits is 559872, while the sum is 49.

The square root of 213638899 is about 14616.3914493284. The cubic root of 213638899 is about 597.8057808224.

The spelling of 213638899 in words is "two hundred thirteen million, six hundred thirty-eight thousand, eight hundred ninety-nine".