673439421 has 16 divisors (see below), whose sum is σ = 929577600. Its totient is φ = 433153728.

The previous prime is 673439419. The next prime is 673439449. The reversal of 673439421 is 124934376.

It is not a de Polignac number, because 673439421 - 2¹ = 673439419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 673439421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673439491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179715 + ... + 183423.

It is an arithmetic number, because the mean of its divisors is an integer number (58098600).

Almost surely, 2^673439421 is an apocalyptic number.

It is an amenable number.

673439421 is a deficient number, since it is larger than the sum of its proper divisors (256138179).

673439421 is a wasteful number, since it uses less digits than its factorization.

673439421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5828.

The product of its digits is 108864, while the sum is 39.

The square root of 673439421 is about 25950.7113775326. The cubic root of 673439421 is about 876.5287760075.

The spelling of 673439421 in words is "six hundred seventy-three million, four hundred thirty-nine thousand, four hundred twenty-one".