1673391273 has 4 divisors (see below), whose sum is σ = 2231188368. Its totient is φ = 1115594180.

The previous prime is 1673391241. The next prime is 1673391283. The reversal of 1673391273 is 3721933761.

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 1673391273 - 2⁵ = 1673391241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1673391283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278898543 + ... + 278898548.

It is an arithmetic number, because the mean of its divisors is an integer number (557797092).

Almost surely, 2^1673391273 is an apocalyptic number.

It is an amenable number.

1673391273 is a deficient number, since it is larger than the sum of its proper divisors (557797095).

1673391273 is an equidigital number, since it uses as much as digits as its factorization.

1673391273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557797094.

The product of its digits is 142884, while the sum is 42.

The square root of 1673391273 is about 40907.1054096962. The cubic root of 1673391273 is about 1187.2235421886.

The spelling of 1673391273 in words is "one billion, six hundred seventy-three million, three hundred ninety-one thousand, two hundred seventy-three".