256432123 has 4 divisors (see below), whose sum is σ = 265274640. Its totient is φ = 247589608.

The previous prime is 256432117. The next prime is 256432133. The reversal of 256432123 is 321234652.

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 256432123 - 2⁹ = 256431611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256432091 and 256432100.

It is not an unprimeable number, because it can be changed into a prime (256432133) 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, 4421215 + ... + 4421272.

It is an arithmetic number, because the mean of its divisors is an integer number (66318660).

Almost surely, 2^256432123 is an apocalyptic number.

256432123 is a deficient number, since it is larger than the sum of its proper divisors (8842517).

256432123 is an equidigital number, since it uses as much as digits as its factorization.

256432123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8842516.

The product of its digits is 8640, while the sum is 28.

The square root of 256432123 is about 16013.4981499983. The cubic root of 256432123 is about 635.3174868853.

Adding to 256432123 its reverse (321234652), we get a palindrome (577666775).

The spelling of 256432123 in words is "two hundred fifty-six million, four hundred thirty-two thousand, one hundred twenty-three".