673453421 has 2 divisors, whose sum is σ = 673453422. Its totient is φ = 673453420.

The previous prime is 673453411. The next prime is 673453513. The reversal of 673453421 is 124354376.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 565916521 + 107536900 = 23789^2 + 10370^2 .

It is a cyclic number.

It is not a de Polignac number, because 673453421 - 2⁶ = 673453357 is a prime.

It is a super-5 number, since 5×673453421⁵ (a number of 45 digits) contains 55555 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (673453411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336726710 + 336726711.

It is an arithmetic number, because the mean of its divisors is an integer number (336726711).

Almost surely, 2^673453421 is an apocalyptic number.

It is an amenable number.

673453421 is a deficient number, since it is larger than the sum of its proper divisors (1).

673453421 is an equidigital number, since it uses as much as digits as its factorization.

673453421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 35.

The square root of 673453421 is about 25950.9811182545. The cubic root of 673453421 is about 876.5348499604.

The spelling of 673453421 in words is "six hundred seventy-three million, four hundred fifty-three thousand, four hundred twenty-one".