212392644 has 12 divisors (see below), whose sum is σ = 495582864. Its totient is φ = 70797544.

The previous prime is 212392643. The next prime is 212392651. The reversal of 212392644 is 446293212.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×212392644² = 90221270450621472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212392643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8849682 + ... + 8849705.

It is an arithmetic number, because the mean of its divisors is an integer number (41298572).

Almost surely, 2^212392644 is an apocalyptic number.

It is an amenable number.

212392644 is an abundant number, since it is smaller than the sum of its proper divisors (283190220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212392644 is a wasteful number, since it uses less digits than its factorization.

212392644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17699394 (or 17699392 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 212392644 is about 14573.6969914981. The cubic root of 212392644 is about 596.6410868150.

The spelling of 212392644 in words is "two hundred twelve million, three hundred ninety-two thousand, six hundred forty-four".