256652421 has 8 divisors (see below), whose sum is σ = 342486144. Its totient is φ = 170960160.

The previous prime is 256652369. The next prime is 256652467. The reversal of 256652421 is 124256652.

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

It is not a de Polignac number, because 256652421 - 2⁷ = 256652293 is a prime.

It is a super-2 number, since 2×256652421² = 131740930410322482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256652491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31056 + ... + 38441.

It is an arithmetic number, because the mean of its divisors is an integer number (42810768).

Almost surely, 2^256652421 is an apocalyptic number.

It is an amenable number.

256652421 is a deficient number, since it is larger than the sum of its proper divisors (85833723).

256652421 is a wasteful number, since it uses less digits than its factorization.

256652421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70731.

The product of its digits is 28800, while the sum is 33.

The square root of 256652421 is about 16020.3751828726. The cubic root of 256652421 is about 635.4993662199.

The spelling of 256652421 in words is "two hundred fifty-six million, six hundred fifty-two thousand, four hundred twenty-one".