671404940 has 12 divisors (see below), whose sum is σ = 1409950416. Its totient is φ = 268561968.

The previous prime is 671404933. The next prime is 671404949. The reversal of 671404940 is 49404176.

It is a self number, because there is not a number n which added to its sum of digits gives 671404940.

It is not an unprimeable number, because it can be changed into a prime (671404949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16785104 + ... + 16785143.

It is an arithmetic number, because the mean of its divisors is an integer number (117495868).

Almost surely, 2^671404940 is an apocalyptic number.

It is an amenable number.

671404940 is an abundant number, since it is smaller than the sum of its proper divisors (738545476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671404940 is a wasteful number, since it uses less digits than its factorization.

671404940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33570256 (or 33570254 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 671404940 is about 25911.4827827355. The cubic root of 671404940 is about 875.6452122762.

The spelling of 671404940 in words is "six hundred seventy-one million, four hundred four thousand, nine hundred forty".