212078609 has 8 divisors (see below), whose sum is σ = 218217888. Its totient is φ = 205985440.

The previous prime is 212078597. The next prime is 212078681. The reversal of 212078609 is 906870212.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212078609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212078809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2087 + ... + 20700.

It is an arithmetic number, because the mean of its divisors is an integer number (27277236).

Almost surely, 2^212078609 is an apocalyptic number.

It is an amenable number.

212078609 is a deficient number, since it is larger than the sum of its proper divisors (6139279).

212078609 is a wasteful number, since it uses less digits than its factorization.

212078609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23055.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 212078609 is about 14562.9189725137. The cubic root of 212078609 is about 596.3468854716.

The spelling of 212078609 in words is "two hundred twelve million, seventy-eight thousand, six hundred nine".