256323493 has 4 divisors (see below), whose sum is σ = 257651788. Its totient is φ = 254995200.

The previous prime is 256323461. The next prime is 256323499. The reversal of 256323493 is 394323652.

It is a happy number.

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 32012964 + 224310529 = 5658^2 + 14977^2 .

It is a cyclic number.

It is not a de Polignac number, because 256323493 - 2⁵ = 256323461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256323499) 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, 663858 + ... + 664243.

It is an arithmetic number, because the mean of its divisors is an integer number (64412947).

Almost surely, 2^256323493 is an apocalyptic number.

It is an amenable number.

256323493 is a deficient number, since it is larger than the sum of its proper divisors (1328295).

256323493 is a wasteful number, since it uses less digits than its factorization.

256323493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328294.

The product of its digits is 116640, while the sum is 37.

The square root of 256323493 is about 16010.1059646712. The cubic root of 256323493 is about 635.2277629648.

The spelling of 256323493 in words is "two hundred fifty-six million, three hundred twenty-three thousand, four hundred ninety-three".