1255863447 has 40 divisors (see below), whose sum is σ = 1913019680. Its totient is φ = 820912320.

The previous prime is 1255863437. The next prime is 1255863449. The reversal of 1255863447 is 7443685521.

1255863447 is a `hidden beast` number, since 1 + 2 + 5 + 5 + 8 + 634 + 4 + 7 = 666.

It is not a de Polignac number, because 1255863447 - 2¹⁴ = 1255847063 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 (1255863449) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 908697 + ... + 910077.

It is an arithmetic number, because the mean of its divisors is an integer number (47825492).

Almost surely, 2^1255863447 is an apocalyptic number.

1255863447 is a deficient number, since it is larger than the sum of its proper divisors (657156233).

1255863447 is a wasteful number, since it uses less digits than its factorization.

1255863447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605 (or 1596 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The square root of 1255863447 is about 35438.1637080704. The cubic root of 1255863447 is about 1078.8990400918.

The spelling of 1255863447 in words is "one billion, two hundred fifty-five million, eight hundred sixty-three thousand, four hundred forty-seven".