212870869 has 8 divisors (see below), whose sum is σ = 215138520. Its totient is φ = 210610176.

The previous prime is 212870857. The next prime is 212870873. The reversal of 212870869 is 968078212.

It can be written as a sum of positive squares in 4 ways, for example, as 819025 + 212051844 = 905^2 + 14562^2 .

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 212870869 - 2¹⁹ = 212346581 is a prime.

It is a super-2 number, since 2×212870869² = 90628013737630322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212870969) 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 7 ways as a sum of consecutive naturals, for example, 78789 + ... + 81445.

It is an arithmetic number, because the mean of its divisors is an integer number (26892315).

Almost surely, 2^212870869 is an apocalyptic number.

It is an amenable number.

212870869 is a deficient number, since it is larger than the sum of its proper divisors (2267651).

212870869 is a wasteful number, since it uses less digits than its factorization.

212870869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3479.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 212870869 is about 14590.0948934543. The cubic root of 212870869 is about 597.0885517812.

The spelling of 212870869 in words is "two hundred twelve million, eight hundred seventy thousand, eight hundred sixty-nine".