256609419 has 12 divisors (see below), whose sum is σ = 376078248. Its totient is φ = 155520640.

The previous prime is 256609417. The next prime is 256609471. The reversal of 256609419 is 914906652.

It is a happy number.

It is not a de Polignac number, because 256609419 - 2¹ = 256609417 is a prime.

It is a super-2 number, since 2×256609419² = 131696787839035122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256609417) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 353094 + ... + 353819.

It is an arithmetic number, because the mean of its divisors is an integer number (31339854).

Almost surely, 2^256609419 is an apocalyptic number.

256609419 is a deficient number, since it is larger than the sum of its proper divisors (119468829).

256609419 is a wasteful number, since it uses less digits than its factorization.

256609419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706938 (or 706927 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 256609419 is about 16019.0330232508. The cubic root of 256609419 is about 635.4638716912.

The spelling of 256609419 in words is "two hundred fifty-six million, six hundred nine thousand, four hundred nineteen".