256407213 has 8 divisors (see below), whose sum is σ = 342292000. Its totient is φ = 170730288.

The previous prime is 256407157. The next prime is 256407227. The reversal of 256407213 is 312704652.

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

It is not a de Polignac number, because 256407213 - 2⁹ = 256406701 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 (256407233) 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, 49063 + ... + 54036.

It is an arithmetic number, because the mean of its divisors is an integer number (42786500).

Almost surely, 2^256407213 is an apocalyptic number.

It is an amenable number.

256407213 is a deficient number, since it is larger than the sum of its proper divisors (85884787).

256407213 is a wasteful number, since it uses less digits than its factorization.

256407213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103931.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 256407213 is about 16012.7203497719. The cubic root of 256407213 is about 635.2969144873.

The spelling of 256407213 in words is "two hundred fifty-six million, four hundred seven thousand, two hundred thirteen".