256438237 has 4 divisors (see below), whose sum is σ = 279750816. Its totient is φ = 233125660.

The previous prime is 256438229. The next prime is 256438241. The reversal of 256438237 is 732834652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256438237 - 2³ = 256438229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256438237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256438037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11656273 + ... + 11656294.

It is an arithmetic number, because the mean of its divisors is an integer number (69937704).

Almost surely, 2^256438237 is an apocalyptic number.

It is an amenable number.

256438237 is a deficient number, since it is larger than the sum of its proper divisors (23312579).

256438237 is a wasteful number, since it uses less digits than its factorization.

256438237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23312578.

The product of its digits is 241920, while the sum is 40.

The square root of 256438237 is about 16013.6890503094. The cubic root of 256438237 is about 635.3225360450.

The spelling of 256438237 in words is "two hundred fifty-six million, four hundred thirty-eight thousand, two hundred thirty-seven".