212409985 has 16 divisors (see below), whose sum is σ = 278595072. Its totient is φ = 154771200.

The previous prime is 212409979. The next prime is 212410049. The reversal of 212409985 is 589904212.

It is not a de Polignac number, because 212409985 - 2²¹ = 210312833 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37671 + ... + 42940.

It is an arithmetic number, because the mean of its divisors is an integer number (17412192).

Almost surely, 2^212409985 is an apocalyptic number.

It is an amenable number.

212409985 is a deficient number, since it is larger than the sum of its proper divisors (66185087).

212409985 is a wasteful number, since it uses less digits than its factorization.

212409985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80664.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 212409985 is about 14574.2919210506. The cubic root of 212409985 is about 596.6573241500.

The spelling of 212409985 in words is "two hundred twelve million, four hundred nine thousand, nine hundred eighty-five".