213408138 has 8 divisors (see below), whose sum is σ = 426816288. Its totient is φ = 71136044.

The previous prime is 213408137. The next prime is 213408203. The reversal of 213408138 is 831804312.

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

213408138 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (213408137) 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, 17784006 + ... + 17784017.

It is an arithmetic number, because the mean of its divisors is an integer number (53352036).

Almost surely, 2^213408138 is an apocalyptic number.

213408138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

213408138 is a wasteful number, since it uses less digits than its factorization.

213408138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35568028.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 213408138 is about 14608.4954050717. The cubic root of 213408138 is about 597.5904642938.

The spelling of 213408138 in words is "two hundred thirteen million, four hundred eight thousand, one hundred thirty-eight".