213689138 has 16 divisors (see below), whose sum is σ = 356326656. Its totient is φ = 95443920.

The previous prime is 213689137. The next prime is 213689141. The reversal of 213689138 is 831986312.

213689138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 213689095 and 213689104.

It is not an unprimeable number, because it can be changed into a prime (213689137) 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, 131756 + ... + 133367.

It is an arithmetic number, because the mean of its divisors is an integer number (22270416).

Almost surely, 2^213689138 is an apocalyptic number.

213689138 is a deficient number, since it is larger than the sum of its proper divisors (142637518).

213689138 is a wasteful number, since it uses less digits than its factorization.

213689138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265169.

The product of its digits is 62208, while the sum is 41.

The square root of 213689138 is about 14618.1099325460. The cubic root of 213689138 is about 597.8526368505.

The spelling of 213689138 in words is "two hundred thirteen million, six hundred eighty-nine thousand, one hundred thirty-eight".