212309845 has 16 divisors (see below), whose sum is σ = 278480448. Its totient is φ = 154103040.

The previous prime is 212309827. The next prime is 212309869. The reversal of 212309845 is 548903212.

It is not a de Polignac number, because 212309845 - 2¹³ = 212301653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212309845.

It is a congruent 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, 26557 + ... + 33613.

It is an arithmetic number, because the mean of its divisors is an integer number (17405028).

Almost surely, 2^212309845 is an apocalyptic number.

It is an amenable number.

212309845 is a deficient number, since it is larger than the sum of its proper divisors (66170603).

212309845 is a wasteful number, since it uses less digits than its factorization.

212309845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7620.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 212309845 is about 14570.8560146616. The cubic root of 212309845 is about 596.5635453564.

The spelling of 212309845 in words is "two hundred twelve million, three hundred nine thousand, eight hundred forty-five".