212456530 has 64 divisors (see below), whose sum is σ = 454035456. Its totient is φ = 70560000.

The previous prime is 212456521. The next prime is 212456549. The reversal of 212456530 is 35654212.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 143695 + ... + 145165.

It is an arithmetic number, because the mean of its divisors is an integer number (7094304).

Almost surely, 2^212456530 is an apocalyptic number.

212456530 is an abundant number, since it is smaller than the sum of its proper divisors (241578926).

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

212456530 is a wasteful number, since it uses less digits than its factorization.

212456530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 212456530 is about 14575.8886521543. Note that the first 3 decimals coincide. The cubic root of 212456530 is about 596.7009024324.

The spelling of 212456530 in words is "two hundred twelve million, four hundred fifty-six thousand, five hundred thirty".