1255640343 has 4 divisors (see below), whose sum is σ = 1674187128. Its totient is φ = 837093560.

The previous prime is 1255640341. The next prime is 1255640359. The reversal of 1255640343 is 3430465521.

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

It is a cyclic number.

It is not a de Polignac number, because 1255640343 - 2¹ = 1255640341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255640341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209273388 + ... + 209273393.

It is an arithmetic number, because the mean of its divisors is an integer number (418546782).

Almost surely, 2^1255640343 is an apocalyptic number.

1255640343 is a deficient number, since it is larger than the sum of its proper divisors (418546785).

1255640343 is an equidigital number, since it uses as much as digits as its factorization.

1255640343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418546784.

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 1255640343 is about 35435.0157753598. The cubic root of 1255640343 is about 1078.8351475438.

The spelling of 1255640343 in words is "one billion, two hundred fifty-five million, six hundred forty thousand, three hundred forty-three".