256025405 has 16 divisors (see below), whose sum is σ = 312097968. Its totient is φ = 201600000.

The previous prime is 256025383. The next prime is 256025417. The reversal of 256025405 is 504520652.

It can be written as a sum of positive squares in 8 ways, for example, as 3247204 + 252778201 = 1802^2 + 15899^2 .

It is not a de Polignac number, because 256025405 - 2⁸ = 256025149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90005 + ... + 92805.

It is an arithmetic number, because the mean of its divisors is an integer number (19506123).

Almost surely, 2^256025405 is an apocalyptic number.

It is an amenable number.

256025405 is a deficient number, since it is larger than the sum of its proper divisors (56072563).

256025405 is a wasteful number, since it uses less digits than its factorization.

256025405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3088.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 256025405 is about 16000.7938865545. The cubic root of 256025405 is about 634.9814242195.

The spelling of 256025405 in words is "two hundred fifty-six million, twenty-five thousand, four hundred five".