673939821 has 16 divisors (see below), whose sum is σ = 908236800. Its totient is φ = 444480048.

The previous prime is 673939811. The next prime is 673939843. The reversal of 673939821 is 128939376.

It is not a de Polignac number, because 673939821 - 2²³ = 665551213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673939811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 461190 + ... + 462648.

It is an arithmetic number, because the mean of its divisors is an integer number (56764800).

Almost surely, 2^673939821 is an apocalyptic number.

It is an amenable number.

673939821 is a deficient number, since it is larger than the sum of its proper divisors (234296979).

673939821 is a wasteful number, since it uses less digits than its factorization.

673939821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3008.

The product of its digits is 489888, while the sum is 48.

The square root of 673939821 is about 25960.3509413875. The cubic root of 673939821 is about 876.7458241898.

The spelling of 673939821 in words is "six hundred seventy-three million, nine hundred thirty-nine thousand, eight hundred twenty-one".