212999783 has 4 divisors (see below), whose sum is σ = 225529200. Its totient is φ = 200470368.

The previous prime is 212999779. The next prime is 212999819. The reversal of 212999783 is 387999212.

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 212999783 - 2² = 212999779 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212999383) 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, 6264683 + ... + 6264716.

It is an arithmetic number, because the mean of its divisors is an integer number (56382300).

Almost surely, 2^212999783 is an apocalyptic number.

212999783 is a deficient number, since it is larger than the sum of its proper divisors (12529417).

212999783 is a wasteful number, since it uses less digits than its factorization.

212999783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12529416.

The product of its digits is 489888, while the sum is 50.

The square root of 212999783 is about 14594.5120850270. The cubic root of 212999783 is about 597.2090591744.

The spelling of 212999783 in words is "two hundred twelve million, nine hundred ninety-nine thousand, seven hundred eighty-three".