670003821 has 12 divisors (see below), whose sum is σ = 1018719520. Its totient is φ = 423160200.

The previous prime is 670003811. The next prime is 670003871. The reversal of 670003821 is 128300076.

It is not a de Polignac number, because 670003821 - 2¹⁰ = 670002797 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 (670003811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1958905 + ... + 1959246.

Almost surely, 2^670003821 is an apocalyptic number.

It is an amenable number.

670003821 is a deficient number, since it is larger than the sum of its proper divisors (348715699).

670003821 is a wasteful number, since it uses less digits than its factorization.

670003821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3918176 (or 3918173 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 670003821 is about 25884.4320200386. The cubic root of 670003821 is about 875.0356757155.

Adding to 670003821 its reverse (128300076), we get a palindrome (798303897).

The spelling of 670003821 in words is "six hundred seventy million, three thousand, eight hundred twenty-one".