256040949 has 4 divisors (see below), whose sum is σ = 341387936. Its totient is φ = 170693964.

The previous prime is 256040947. The next prime is 256040987. The reversal of 256040949 is 949040652.

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 not a de Polignac number, because 256040949 - 2¹ = 256040947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256040947) 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, 42673489 + ... + 42673494.

It is an arithmetic number, because the mean of its divisors is an integer number (85346984).

Almost surely, 2^256040949 is an apocalyptic number.

It is an amenable number.

256040949 is a deficient number, since it is larger than the sum of its proper divisors (85346987).

256040949 is an equidigital number, since it uses as much as digits as its factorization.

256040949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85346986.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 256040949 is about 16001.2796050816. The cubic root of 256040949 is about 634.9942744436.

The spelling of 256040949 in words is "two hundred fifty-six million, forty thousand, nine hundred forty-nine".