672379921 has 2 divisors, whose sum is σ = 672379922. Its totient is φ = 672379920.

The previous prime is 672379919. The next prime is 672379931. The reversal of 672379921 is 129973276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 671379921 + 1000000 = 25911^2 + 1000^2 .

It is a cyclic number.

It is not a de Polignac number, because 672379921 - 2¹ = 672379919 is a prime.

It is a super-3 number, since 3×672379921³ (a number of 27 digits) contains 333 as substring.

Together with 672379919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (672379931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336189960 + 336189961.

It is an arithmetic number, because the mean of its divisors is an integer number (336189961).

Almost surely, 2^672379921 is an apocalyptic number.

It is an amenable number.

672379921 is a deficient number, since it is larger than the sum of its proper divisors (1).

672379921 is an equidigital number, since it uses as much as digits as its factorization.

672379921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 46.

The square root of 672379921 is about 25930.2896435809. The cubic root of 672379921 is about 876.0688634764.

The spelling of 672379921 in words is "six hundred seventy-two million, three hundred seventy-nine thousand, nine hundred twenty-one".