671994212 has 6 divisors (see below), whose sum is σ = 1175989878. Its totient is φ = 335997104.

The previous prime is 671994209. The next prime is 671994217. The reversal of 671994212 is 212499176.

It can be written as a sum of positive squares in only one way, i.e., 611869696 + 60124516 = 24736^2 + 7754^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 671994212.

It is not an unprimeable number, because it can be changed into a prime (671994217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83999273 + ... + 83999280.

It is an arithmetic number, because the mean of its divisors is an integer number (195998313).

Almost surely, 2^671994212 is an apocalyptic number.

It is an amenable number.

671994212 is a deficient number, since it is larger than the sum of its proper divisors (503995666).

671994212 is a wasteful number, since it uses less digits than its factorization.

671994212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167998557 (or 167998555 counting only the distinct ones).

The product of its digits is 54432, while the sum is 41.

The square root of 671994212 is about 25922.8511549174. The cubic root of 671994212 is about 875.9013132227.

The spelling of 671994212 in words is "six hundred seventy-one million, nine hundred ninety-four thousand, two hundred twelve".