212247409 has 8 divisors (see below), whose sum is σ = 231648480. Its totient is φ = 192864000.

The previous prime is 212247403. The next prime is 212247419. The reversal of 212247409 is 904742212.

212247409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 212247409 - 2¹⁵ = 212214641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212247403) 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, 41809 + ... + 46609.

It is an arithmetic number, because the mean of its divisors is an integer number (28956060).

Almost surely, 2^212247409 is an apocalyptic number.

It is an amenable number.

212247409 is a deficient number, since it is larger than the sum of its proper divisors (19401071).

212247409 is a wasteful number, since it uses less digits than its factorization.

212247409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8831.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 212247409 is about 14568.7133611723. The cubic root of 212247409 is about 596.5050605614.

The spelling of 212247409 in words is "two hundred twelve million, two hundred forty-seven thousand, four hundred nine".