212438638 has 8 divisors (see below), whose sum is σ = 318731040. Its totient is φ = 106194960.

The previous prime is 212438627. The next prime is 212438657. The reversal of 212438638 is 836834212.

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

It is a junction number, because it is equal to n+sod(n) for n = 212438597 and 212438606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2043 + ... + 20713.

It is an arithmetic number, because the mean of its divisors is an integer number (39841380).

Almost surely, 2^212438638 is an apocalyptic number.

212438638 is a deficient number, since it is larger than the sum of its proper divisors (106292402).

212438638 is a wasteful number, since it uses less digits than its factorization.

212438638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24362.

The product of its digits is 55296, while the sum is 37.

The square root of 212438638 is about 14575.2748859155. The cubic root of 212438638 is about 596.6841515983.

The spelling of 212438638 in words is "two hundred twelve million, four hundred thirty-eight thousand, six hundred thirty-eight".