212392979 has 4 divisors (see below), whose sum is σ = 215992920. Its totient is φ = 208793040.

The previous prime is 212392969. The next prime is 212392991. The reversal of 212392979 is 979293212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212392979 - 2²⁰ = 211344403 is a prime.

It is a super-2 number, since 2×212392979² = 90221555056988882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212392969) 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, 1799882 + ... + 1799999.

It is an arithmetic number, because the mean of its divisors is an integer number (53998230).

Almost surely, 2^212392979 is an apocalyptic number.

212392979 is a deficient number, since it is larger than the sum of its proper divisors (3599941).

212392979 is an equidigital number, since it uses as much as digits as its factorization.

212392979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3599940.

The product of its digits is 122472, while the sum is 44.

The square root of 212392979 is about 14573.7084848023. The cubic root of 212392979 is about 596.6414005024.

The spelling of 212392979 in words is "two hundred twelve million, three hundred ninety-two thousand, nine hundred seventy-nine".