213408638 has 8 divisors (see below), whose sum is σ = 324498288. Its totient is φ = 105242544.

The previous prime is 213408553. The next prime is 213408647. The reversal of 213408638 is 836804312.

It is a happy number.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 213408598 and 213408607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 730706 + ... + 730997.

It is an arithmetic number, because the mean of its divisors is an integer number (40562286).

Almost surely, 2^213408638 is an apocalyptic number.

213408638 is a deficient number, since it is larger than the sum of its proper divisors (111089650).

213408638 is a wasteful number, since it uses less digits than its factorization.

213408638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1461778.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 213408638 is about 14608.5125183915. The cubic root of 213408638 is about 597.5909309973.

The spelling of 213408638 in words is "two hundred thirteen million, four hundred eight thousand, six hundred thirty-eight".