256242385 has 16 divisors (see below), whose sum is σ = 351677952. Its totient is φ = 175579200.

The previous prime is 256242361. The next prime is 256242391. The reversal of 256242385 is 583242652.

It is not a de Polignac number, because 256242385 - 2¹⁵ = 256209617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92115 + ... + 94855.

It is an arithmetic number, because the mean of its divisors is an integer number (21979872).

Almost surely, 2^256242385 is an apocalyptic number.

It is an amenable number.

256242385 is a deficient number, since it is larger than the sum of its proper divisors (95435567).

256242385 is a wasteful number, since it uses less digits than its factorization.

256242385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5424.

The product of its digits is 115200, while the sum is 37.

The square root of 256242385 is about 16007.5727391757. The cubic root of 256242385 is about 635.1607545554.

The spelling of 256242385 in words is "two hundred fifty-six million, two hundred forty-two thousand, three hundred eighty-five".