256746242 has 16 divisors (see below), whose sum is σ = 397222272. Its totient is φ = 124393200.

The previous prime is 256746241. The next prime is 256746271. The reversal of 256746242 is 242647652.

It is a happy number.

It is a super-2 number, since 2×256746242² = 131837265562245128, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256746196 and 256746205.

It is not an unprimeable number, because it can be changed into a prime (256746241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4028 + ... + 23015.

It is an arithmetic number, because the mean of its divisors is an integer number (24826392).

Almost surely, 2^256746242 is an apocalyptic number.

256746242 is a deficient number, since it is larger than the sum of its proper divisors (140476030).

256746242 is a wasteful number, since it uses less digits than its factorization.

256746242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27193.

The product of its digits is 161280, while the sum is 38.

The square root of 256746242 is about 16023.3030926835. The cubic root of 256746242 is about 635.5767937930.

The spelling of 256746242 in words is "two hundred fifty-six million, seven hundred forty-six thousand, two hundred forty-two".