256205423 has 8 divisors (see below), whose sum is σ = 257592720. Its totient is φ = 254822400.

The previous prime is 256205407. The next prime is 256205449. The reversal of 256205423 is 324502652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256205423 - 2⁴ = 256205407 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 (256205123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243248 + ... + 244298.

It is an arithmetic number, because the mean of its divisors is an integer number (32199090).

Almost surely, 2^256205423 is an apocalyptic number.

256205423 is a deficient number, since it is larger than the sum of its proper divisors (1387297).

256205423 is a wasteful number, since it uses less digits than its factorization.

256205423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2137.

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 256205423 is about 16006.4181814671. The cubic root of 256205423 is about 635.1302132371.

The spelling of 256205423 in words is "two hundred fifty-six million, two hundred five thousand, four hundred twenty-three".