212879923 has 4 divisors (see below), whose sum is σ = 220220640. Its totient is φ = 205539208.

The previous prime is 212879921. The next prime is 212879993. The reversal of 212879923 is 329978212.

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 212879923 - 2¹ = 212879921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212879923.

It is not an unprimeable number, because it can be changed into a prime (212879921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3670315 + ... + 3670372.

It is an arithmetic number, because the mean of its divisors is an integer number (55055160).

Almost surely, 2^212879923 is an apocalyptic number.

212879923 is a deficient number, since it is larger than the sum of its proper divisors (7340717).

212879923 is an equidigital number, since it uses as much as digits as its factorization.

212879923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7340716.

The product of its digits is 108864, while the sum is 43.

The square root of 212879923 is about 14590.4051691514. The cubic root of 212879923 is about 597.0970169493.

The spelling of 212879923 in words is "two hundred twelve million, eight hundred seventy-nine thousand, nine hundred twenty-three".