1255387487 has 4 divisors (see below), whose sum is σ = 1286006736. Its totient is φ = 1224768240.

The previous prime is 1255387481. The next prime is 1255387489. The reversal of 1255387487 is 7847835521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7847835521 = 827 ⋅9489523.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1255387487 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 (1255387481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15309563 + ... + 15309644.

It is an arithmetic number, because the mean of its divisors is an integer number (321501684).

Almost surely, 2^1255387487 is an apocalyptic number.

1255387487 is a deficient number, since it is larger than the sum of its proper divisors (30619249).

1255387487 is an equidigital number, since it uses as much as digits as its factorization.

1255387487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30619248.

The product of its digits is 1881600, while the sum is 50.

The square root of 1255387487 is about 35431.4477124489. The cubic root of 1255387487 is about 1078.7627254646.

The spelling of 1255387487 in words is "one billion, two hundred fifty-five million, three hundred eighty-seven thousand, four hundred eighty-seven".