256417403 has 16 divisors (see below), whose sum is σ = 287370720. Its totient is φ = 226771200.

The previous prime is 256417397. The next prime is 256417411. The reversal of 256417403 is 304714652.

It is a cyclic number.

It is not a de Polignac number, because 256417403 - 2¹⁶ = 256351867 is a prime.

It is a super-2 number, since 2×256417403² = 131499769122528818, which contains 22 as substring.

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 256417403.

It is not an unprimeable number, because it can be changed into a prime (256417303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229001 + ... + 230117.

It is an arithmetic number, because the mean of its divisors is an integer number (17960670).

Almost surely, 2^256417403 is an apocalyptic number.

256417403 is a deficient number, since it is larger than the sum of its proper divisors (30953317).

256417403 is a wasteful number, since it uses less digits than its factorization.

256417403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 256417403 is about 16013.0385311470. The cubic root of 256417403 is about 635.3053302539.

The spelling of 256417403 in words is "two hundred fifty-six million, four hundred seventeen thousand, four hundred three".