256406469 has 8 divisors (see below), whose sum is σ = 372954912. Its totient is φ = 155397840.

The previous prime is 256406467. The next prime is 256406471. The reversal of 256406469 is 964604652.

It is an interprime number because it is at equal distance from previous prime (256406467) and next prime (256406471).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256406469 - 2¹ = 256406467 is a prime.

It is a super-2 number, since 2×256406469² = 131488554690095922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 256406469.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256406467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3884914 + ... + 3884979.

It is an arithmetic number, because the mean of its divisors is an integer number (46619364).

Almost surely, 2^256406469 is an apocalyptic number.

It is an amenable number.

256406469 is a deficient number, since it is larger than the sum of its proper divisors (116548443).

256406469 is a wasteful number, since it uses less digits than its factorization.

256406469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7769907.

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 256406469 is about 16012.6971182246. The cubic root of 256406469 is about 635.2963000202.

The spelling of 256406469 in words is "two hundred fifty-six million, four hundred six thousand, four hundred sixty-nine".