255709869 has 8 divisors (see below), whose sum is σ = 361002240. Its totient is φ = 160445376.

The previous prime is 255709829. The next prime is 255709879. The reversal of 255709869 is 968907552.

It is a happy number.

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

It is not a de Polignac number, because 255709869 - 2⁹ = 255709357 is a prime.

It is a super-2 number, since 2×255709869² = 130775074207994322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 5013919 = 255709869 / (2 + 5 + 5 + 7 + 0 + 9 + 8 + 6 + 9).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255709829) 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, 2506909 + ... + 2507010.

It is an arithmetic number, because the mean of its divisors is an integer number (45125280).

Almost surely, 2^255709869 is an apocalyptic number.

It is an amenable number.

255709869 is a deficient number, since it is larger than the sum of its proper divisors (105292371).

255709869 is a wasteful number, since it uses less digits than its factorization.

255709869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5013939.

The product of its (nonzero) digits is 1360800, while the sum is 51.

The square root of 255709869 is about 15990.9308359457. The cubic root of 255709869 is about 634.7204581050.

The spelling of 255709869 in words is "two hundred fifty-five million, seven hundred nine thousand, eight hundred sixty-nine".