256654042 has 4 divisors (see below), whose sum is σ = 384981066. Its totient is φ = 128327020.

The previous prime is 256654009. The next prime is 256654043. The reversal of 256654042 is 240456652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 252206161 + 4447881 = 15881^2 + 2109^2 .

It is a junction number, because it is equal to n+sod(n) for n = 256653989 and 256654007.

It is not an unprimeable number, because it can be changed into a prime (256654043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64163509 + ... + 64163512.

Almost surely, 2^256654042 is an apocalyptic number.

256654042 is a deficient number, since it is larger than the sum of its proper divisors (128327024).

256654042 is a wasteful number, since it uses less digits than its factorization.

256654042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128327023.

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 256654042 is about 16020.4257746166. The cubic root of 256654042 is about 635.5007041413.

The spelling of 256654042 in words is "two hundred fifty-six million, six hundred fifty-four thousand, forty-two".