673388421 has 4 divisors (see below), whose sum is σ = 897851232. Its totient is φ = 448925612.

The previous prime is 673388399. The next prime is 673388431. The reversal of 673388421 is 124883376.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 673388421 - 2⁵ = 673388389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673388431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112231401 + ... + 112231406.

It is an arithmetic number, because the mean of its divisors is an integer number (224462808).

Almost surely, 2^673388421 is an apocalyptic number.

It is an amenable number.

673388421 is a deficient number, since it is larger than the sum of its proper divisors (224462811).

673388421 is a wasteful number, since it uses less digits than its factorization.

673388421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224462810.

The product of its digits is 193536, while the sum is 42.

The square root of 673388421 is about 25949.7287269058. The cubic root of 673388421 is about 876.5066487532.

The spelling of 673388421 in words is "six hundred seventy-three million, three hundred eighty-eight thousand, four hundred twenty-one".