1255439387 has 2 divisors, whose sum is σ = 1255439388. Its totient is φ = 1255439386.

The previous prime is 1255439363. The next prime is 1255439389. The reversal of 1255439387 is 7839345521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1255439387 - 2²⁸ = 987003931 is a prime.

It is a super-2 number, since 2×1255439387² = 3152256108861871538, which contains 22 as substring.

Together with 1255439389, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1255439389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627719693 + 627719694.

It is an arithmetic number, because the mean of its divisors is an integer number (627719694).

Almost surely, 2^1255439387 is an apocalyptic number.

1255439387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255439387 is an equidigital number, since it uses as much as digits as its factorization.

1255439387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 47.

The square root of 1255439387 is about 35432.1801050966. The cubic root of 1255439387 is about 1078.7775912635. Note that the first 3 decimals are identical.

The spelling of 1255439387 in words is "one billion, two hundred fifty-five million, four hundred thirty-nine thousand, three hundred eighty-seven".