1672219805 has 4 divisors (see below), whose sum is σ = 2006663772. Its totient is φ = 1337775840.

The previous prime is 1672219793. The next prime is 1672219817. The reversal of 1672219805 is 5089122761.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1672219793) and next prime (1672219817).

It can be written as a sum of positive squares in 2 ways, for example, as 587044441 + 1085175364 = 24229^2 + 32942^2 .

It is not a de Polignac number, because 1672219805 - 2⁶ = 1672219741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167221976 + ... + 167221985.

It is an arithmetic number, because the mean of its divisors is an integer number (501665943).

Almost surely, 2^1672219805 is an apocalyptic number.

It is an amenable number.

1672219805 is a deficient number, since it is larger than the sum of its proper divisors (334443967).

1672219805 is an equidigital number, since it uses as much as digits as its factorization.

1672219805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334443966.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 1672219805 is about 40892.7842656868. The cubic root of 1672219805 is about 1186.9464364329.

The spelling of 1672219805 in words is "one billion, six hundred seventy-two million, two hundred nineteen thousand, eight hundred five".