140243555 has 4 divisors (see below), whose sum is σ = 168292272. Its totient is φ = 112194840.

The previous prime is 140243549. The next prime is 140243563. The reversal of 140243555 is 555342041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 555342041 = 23071 ⋅24071.

It is not a de Polignac number, because 140243555 - 2¹⁶ = 140178019 is a prime.

It is a Duffinian 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, 14024351 + ... + 14024360.

It is an arithmetic number, because the mean of its divisors is an integer number (42073068).

Almost surely, 2^140243555 is an apocalyptic number.

140243555 is a deficient number, since it is larger than the sum of its proper divisors (28048717).

140243555 is an equidigital number, since it uses as much as digits as its factorization.

140243555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28048716.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 140243555 is about 11842.4471710876. The cubic root of 140243555 is about 519.5503447667.

Adding to 140243555 its reverse (555342041), we get a palindrome (695585596).

The spelling of 140243555 in words is "one hundred forty million, two hundred forty-three thousand, five hundred fifty-five".