212789643 has 16 divisors (see below), whose sum is σ = 311955456. Its totient is φ = 127945440.

The previous prime is 212789593. The next prime is 212789669. The reversal of 212789643 is 346987212.

It is not a de Polignac number, because 212789643 - 2⁹ = 212789131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212789595 and 212789604.

It is not an unprimeable number, because it can be changed into a prime (212789693) 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, 21196 + ... + 29577.

It is an arithmetic number, because the mean of its divisors is an integer number (19497216).

Almost surely, 2^212789643 is an apocalyptic number.

212789643 is a deficient number, since it is larger than the sum of its proper divisors (99165813).

212789643 is a wasteful number, since it uses less digits than its factorization.

212789643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50914.

The product of its digits is 145152, while the sum is 42.

The square root of 212789643 is about 14587.3110270536. The cubic root of 212789643 is about 597.0125976203.

The spelling of 212789643 in words is "two hundred twelve million, seven hundred eighty-nine thousand, six hundred forty-three".