212566840 has 16 divisors (see below), whose sum is σ = 478275480. Its totient is φ = 85026720.

The previous prime is 212566831. The next prime is 212566841. The reversal of 212566840 is 48665212.

It is a super-2 number, since 2×212566840² = 90369322935171200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212566796 and 212566805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212566841) 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, 2657046 + ... + 2657125.

Almost surely, 2^212566840 is an apocalyptic number.

212566840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212566840 is an abundant number, since it is smaller than the sum of its proper divisors (265708640).

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

212566840 is a wasteful number, since it uses less digits than its factorization.

212566840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5314182 (or 5314178 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 212566840 is about 14579.6721499491. The cubic root of 212566840 is about 596.8041560061.

The spelling of 212566840 in words is "two hundred twelve million, five hundred sixty-six thousand, eight hundred forty".