212969947 has 4 divisors (see below), whose sum is σ = 214380496. Its totient is φ = 211559400.

The previous prime is 212969941. The next prime is 212969963. The reversal of 212969947 is 749969212.

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 212969947 - 2⁷ = 212969819 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 212969947.

It is not an unprimeable number, because it can be changed into a prime (212969941) 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, 705048 + ... + 705349.

It is an arithmetic number, because the mean of its divisors is an integer number (53595124).

Almost surely, 2^212969947 is an apocalyptic number.

212969947 is a deficient number, since it is larger than the sum of its proper divisors (1410549).

212969947 is a wasteful number, since it uses less digits than its factorization.

212969947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410548.

The product of its digits is 489888, while the sum is 49.

The square root of 212969947 is about 14593.4898841915. The cubic root of 212969947 is about 597.1811731342.

The spelling of 212969947 in words is "two hundred twelve million, nine hundred sixty-nine thousand, nine hundred forty-seven".