213738918 has 32 divisors (see below), whose sum is σ = 434484960. Its totient is φ = 70087680.

The previous prime is 213738913. The next prime is 213738919. The reversal of 213738918 is 819837312.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 213738918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213738913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104328 + ... + 106356.

It is an arithmetic number, because the mean of its divisors is an integer number (13577655).

Almost surely, 2^213738918 is an apocalyptic number.

213738918 is an abundant number, since it is smaller than the sum of its proper divisors (220746042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213738918 is a wasteful number, since it uses less digits than its factorization.

213738918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2312.

The product of its digits is 72576, while the sum is 42.

The square root of 213738918 is about 14619.8125158977. The cubic root of 213738918 is about 597.8990575434.

The spelling of 213738918 in words is "two hundred thirteen million, seven hundred thirty-eight thousand, nine hundred eighteen".