212690 has 8 divisors (see below), whose sum is σ = 382860. Its totient is φ = 85072.

The previous prime is 212683. The next prime is 212701. The reversal of 212690 is 96212.

212690 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 212521 + 169 = 461^2 + 13^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×212690² = 90474072200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10625 + ... + 10644.

2²¹²⁶⁹⁰ is an apocalyptic number.

212690 is a deficient number, since it is larger than the sum of its proper divisors (170170).

212690 is a wasteful number, since it uses less digits than its factorization.

212690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21276.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 212690 is about 461.1832607543. The cubic root of 212690 is about 59.6919395380.

The spelling of 212690 in words is "two hundred twelve thousand, six hundred ninety".