213638109 has 8 divisors (see below), whose sum is σ = 299843040. Its totient is φ = 134929296.

The previous prime is 213638107. The next prime is 213638119. The reversal of 213638109 is 901836312.

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

It is not a de Polignac number, because 213638109 - 2¹ = 213638107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213638109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213638107) 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, 1873962 + ... + 1874075.

It is an arithmetic number, because the mean of its divisors is an integer number (37480380).

Almost surely, 2^213638109 is an apocalyptic number.

It is an amenable number.

213638109 is a deficient number, since it is larger than the sum of its proper divisors (86204931).

213638109 is a wasteful number, since it uses less digits than its factorization.

213638109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3748059.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 213638109 is about 14616.3644248493. The cubic root of 213638109 is about 597.8050439605.

The spelling of 213638109 in words is "two hundred thirteen million, six hundred thirty-eight thousand, one hundred nine".