273638993 has 4 divisors (see below), whose sum is σ = 273900900. Its totient is φ = 273377088.

The previous prime is 273638977. The next prime is 273639017. The reversal of 273638993 is 399836372.

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

It can be written as a sum of positive squares in 2 ways, for example, as 184090624 + 89548369 = 13568^2 + 9463^2 .

It is a cyclic number.

It is not a de Polignac number, because 273638993 - 2⁴ = 273638977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (273638903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129380 + ... + 131477.

It is an arithmetic number, because the mean of its divisors is an integer number (68475225).

Almost surely, 2^273638993 is an apocalyptic number.

It is an amenable number.

273638993 is a deficient number, since it is larger than the sum of its proper divisors (261907).

273638993 is a wasteful number, since it uses less digits than its factorization.

273638993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261906.

The product of its digits is 1469664, while the sum is 50.

The square root of 273638993 is about 16542.0371478243. The cubic root of 273638993 is about 649.2211523434.

The spelling of 273638993 in words is "two hundred seventy-three million, six hundred thirty-eight thousand, nine hundred ninety-three".