1255209678 has 24 divisors (see below), whose sum is σ = 2731302288. Its totient is φ = 416606112.

The previous prime is 1255209677. The next prime is 1255209679. The reversal of 1255209678 is 8769025521.

1255209678 is a `hidden beast` number, since 1 + 2 + 552 + 0 + 96 + 7 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (1255209677) and next prime (1255209679).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255209677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 145450 + ... + 153837.

It is an arithmetic number, because the mean of its divisors is an integer number (113804262).

Almost surely, 2^1255209678 is an apocalyptic number.

1255209678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1255209678 is an abundant number, since it is smaller than the sum of its proper divisors (1476092610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1255209678 is a wasteful number, since it uses less digits than its factorization.

1255209678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299528 (or 299525 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The square root of 1255209678 is about 35428.9384260946. The cubic root of 1255209678 is about 1078.7117922454.

The spelling of 1255209678 in words is "one billion, two hundred fifty-five million, two hundred nine thousand, six hundred seventy-eight".