212989636 has 6 divisors (see below), whose sum is σ = 372731870. Its totient is φ = 106494816.

The previous prime is 212989619. The next prime is 212989643. The reversal of 212989636 is 636989212.

It can be written as a sum of positive squares in only one way, i.e., 144000000 + 68989636 = 12000^2 + 8306^2 .

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26623701 + ... + 26623708.

Almost surely, 2^212989636 is an apocalyptic number.

It is an amenable number.

212989636 is a deficient number, since it is larger than the sum of its proper divisors (159742234).

212989636 is a wasteful number, since it uses less digits than its factorization.

212989636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53247413 (or 53247411 counting only the distinct ones).

The product of its digits is 279936, while the sum is 46.

The square root of 212989636 is about 14594.1644502178. The cubic root of 212989636 is about 597.1995756334.

The spelling of 212989636 in words is "two hundred twelve million, nine hundred eighty-nine thousand, six hundred thirty-six".