256745423 has 24 divisors (see below), whose sum is σ = 299186160. Its totient is φ = 219542400.

The previous prime is 256745413. The next prime is 256745429. The reversal of 256745423 is 324547652.

It is not a de Polignac number, because 256745423 - 2²² = 252551119 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256745429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 415811 + ... + 416427.

It is an arithmetic number, because the mean of its divisors is an integer number (12466090).

Almost surely, 2^256745423 is an apocalyptic number.

256745423 is a deficient number, since it is larger than the sum of its proper divisors (42440737).

256745423 is a wasteful number, since it uses less digits than its factorization.

256745423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839 (or 828 counting only the distinct ones).

The product of its digits is 201600, while the sum is 38.

The square root of 256745423 is about 16023.2775361347. The cubic root of 256745423 is about 635.5761179793.

The spelling of 256745423 in words is "two hundred fifty-six million, seven hundred forty-five thousand, four hundred twenty-three".