256000042 has 16 divisors (see below), whose sum is σ = 413257032. Its totient is φ = 118494720.

The previous prime is 256000033. The next prime is 256000057. The reversal of 256000042 is 240000652.

It can be written as a sum of positive squares in 4 ways, for example, as 201668401 + 54331641 = 14201^2 + 7371^2 .

It is a junction number, because it is equal to n+sod(n) for n = 255999983 and 256000019.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59643 + ... + 63790.

Almost surely, 2^256000042 is an apocalyptic number.

256000042 is a deficient number, since it is larger than the sum of its proper divisors (157256990).

256000042 is a wasteful number, since it uses less digits than its factorization.

256000042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123513.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 256000042 is about 16000.0013124999. The cubic root of 256000042 is about 634.9604555117.

Adding to 256000042 its reverse (240000652), we get a palindrome (496000694).

The spelling of 256000042 in words is "two hundred fifty-six million, forty-two", and thus it is an aban number.