1255862993 has 18 divisors (see below), whose sum is σ = 1605792258. Its totient is φ = 978589920.

The previous prime is 1255862911. The next prime is 1255862999. The reversal of 1255862993 is 3992685521.

It can be written as a sum of positive squares in only one way, i.e., 1065891904 + 189971089 = 32648^2 + 13783^2 .

It is not a de Polignac number, because 1255862993 - 2⁸ = 1255862737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1255862999) 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 17 ways as a sum of consecutive naturals, for example, 99980 + ... + 111837.

It is an arithmetic number, because the mean of its divisors is an integer number (89210681).

Almost surely, 2^1255862993 is an apocalyptic number.

It is an amenable number.

1255862993 is a deficient number, since it is larger than the sum of its proper divisors (349929265).

1255862993 is a wasteful number, since it uses less digits than its factorization.

1255862993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211853 (or 211835 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 50.

The square root of 1255862993 is about 35438.1573025461. The cubic root of 1255862993 is about 1078.8989100829.

The spelling of 1255862993 in words is "one billion, two hundred fifty-five million, eight hundred sixty-two thousand, nine hundred ninety-three".